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HP P4000 Multi-Site HA/DR Solution Pack User Guide

1. fi Available Systems 3 i E ManagementGroup_1 Name i HES Events E site HH Servers 2 E Systems 2 IP Address Model Manager Special Mana RAID Status Ya Administration system 1 10 0 13 246 P4000 VSA ESX Normal Normal re Stes L System 2 10 0 11 244 P4000 VSA ESX Normal Normal B cluster_1 EE Performance Monitor 1 a Storage Systems 4 Systems 2 IP Address Model Manager Special Mana RAID Status _ r lumes 2 and Snapshots 0 amp System4 10 0 61 36 DELL2950 Normal Normal E Bio Volume _1 0 L System 5 10 0 59 41 DL320s Normal Normal Bin Volume _2 0 E Unassigned servers 2 Description iSCSI Mode Initiator Nod CHAP Name Load Balancing eal Server_1 No CHAP requir iqn 1991 05 com Enabled f fe Server_2 No CHAP requir iqn 1991 05 com Enabled 4 M gt Tasks Converting an existing SAN to a Multi Site SAN Plan the conversion according to the criteria described in Preparing to convert an existing SAN to a Multi Site SAN page 20 Prerequisites e Upgrade all storage systems to SAN iQ software version 7 0 or later e Obtain the feature keys for storage systems to be used in the Multi Site cluster e Apply the feature keys to the storage systems e Add or remove storage systems to the cluster if necessary to ensure you can have equal numbers of storage systems in each site The wizard will not let you create sites with different nu
2. A standard cluster is one that does not use any of the Multi Site features within the SAN iQ software Standard clusters e Cannot contain storage systems that are designated to reside in a site e Cannot contain storage systems that span subnets e Can only have a single VIP Storage server software maintains the customer s data It reads to and writes from disks in response to customer reads and writes of SANiQ volumes Striped data is stored across all disks in the array which increases performance but does not provide fault tolerance The process of copying the most recent snapshot from the primary volume to a new remote snapshot On failback synchronization is the process of copying the most recent remote snapshot back to the primary volume The CMC displays the progress of this synchronization Also you can manually synchronize if necessary to include data that is on the remote volume but not the primary Target secret is used in both 1 way and 2 way CHAP when the target volume challenges the iSCSI initiator Temporary space is created when a snapshot is mounted for use by applications and operating systems that need to write to the snapshot when they access it Temporary space can be converted to a volume using the SmartClone process Thin provisioning reserves less space on the SAN than is presented to application servers A type of SNMP message used to signal that an event has occurred SNIA The Trap Community
3. 38 Index deleting a site 27 designating a primary site 27 designing Multi Site SAN 4 network for Multi Site SAN 11 document related information 31 documentation HP website 31 E editing a site 27 F Failover Manager best practices 11 capability of Multi Site SAN 4 common configurations with managers 7 common configurations with recommended Failover Manager 18 configuration with dual redundant links between 2 sites and Failover Manager in 3rd site 11 configuration with triangular network with Failover Manager 11 configuring 24 installing 25 overview 4 typical configuration with 3rd site 7 G glossary for SAN iQ software and HP P4000 SAN 32 H help obtaining 30 high availability data protection level 5 site and manager configuration 6 HP technical support 30 implementing the Multi Site SAN 20 Insight Remote Support software 30 installation preparing for 20 installing the Multi Site SAN 20 M management group creating 21 manager common configurations with Multi Site SANs 7 configuration best practices 18 configuring Failover Manager 24 configuring for high availability and redundancy 6 configuring for Multi Site SAN 24 configuring regular 24 failover for Multi Site SAN 4 failover in typical 3rd site configuration 7 overview 24 map view for sites 26 MPIO and multiple subnets 17 Multi Site cluster creating 21 removing storage systems
4. site SmartClone volume snapshot set snapshot SNMP traps solution pack split mirror standard cluster storage server stripe synchronize target secret temporary space thin provisioning trap Trap Community String unicast VIP virtual IP address virtual machine virtual manager volume volume lists 36 Glossary Shared snapshots occur when a clone point is created from a newer snapshot that has older snapshots below it in the tree All the volumes created from the clone point will display these older snapshots that they share as well as the clone point A user designated location in which storage systems are installed Multi Site SAN configurations have multiple sites with storage systems in each site and each site has its own subnet A site can be a logical configuration such as a subnet within the same data center department or application SmartClone volumes are space efficient copies of existing volumes or snapshots They appear as multiple volumes that share a common snapshot called a clone point They share this snapshot data on the SAN Application managed snapshots created for a volume set A fixed version of a volume for use with backup and other applications Use traps to have an SNMP tool send alerts when a monitoring threshold is reached HP P4000 Windows Solution Pack A full copy of data that has been split off from the original and is no longer being updated Also known as a cluster
5. H Performance Monitor T ste_2 m oars Storage Systems 4 ESystems IP Address Model Manager Special Mana RAID Status H Volumes 2 and Snapshots 0 System4 10 0 61 36 DELL2950 Normal Normal Bio Volume_1 0 System 5 10 0 59 41 DL320s Normal Normal Gio Volume_2 0 5 Unassigned Servers 2 Description iSCSI Mode Initiator Nod CHAP Name Load Balancing tS Server_1 No CHAP requir iqn 1991 05 com Enabled oat Server_2 No CHAP requir _iqn 1991 05 com Enabled 4 il gt Tasks A management group can contain multiple clusters some of which are Multi Site and some of which are not The Sites tab shows which clusters have sites and which do not listed as Unassigned Sites map view The Map View tab is useful for viewing the site assignments of the storage systems and servers For more information on using the map view tools see the HP P4000 SAN Solution User Guide Sites map views include the following 26 Implementing a Multi Site SAN e Sites e Sites Grouped Designating a primary site Use the Primary designation when you are using the Multi Site cluster to maintain a primary site and a second site as a backup site Designate the site as Primary when you create the site or you can edit an existing site to make it primary Only one site can be designated as Primary in a Multi Site cluster Make sure that the majority of managers are in the Primary site Adding a site Cre
6. The following diagrams illustrate best practice for four different configurations e Three physical sites cluster spans two sites Failover Manager in third site page 8 e Two physical sites logical third site cluster spans two sites Failover Manager in logical third site page 8 e Three physical sites cluster spans three sites page 9 e Two physical sites cluster spans two sites one site is the primary site page 9 Designing a Multi Site SAN 7 Figure 2 Three physical sites cluster spans two sites Failover Manager in third site Manager Failover Manager Management Group 1 Volumes are configured with Network RAID 10 Figure 3 Two physical sites logical third site cluster spans two sites Failover Manager in logical third site Failover Manager Management Group 1 Volumes are configured with Network RAID 10 Designing a Multi Site SAN a GUG Management Group 1 Volumes are configured with Network RAID 10 1 ster spans t Manager Sahl ae Storage Cluster Management Group 1 Volumes are configured with Network RAID 10 Alternativ The Multi Site SAN software apon many other valid E than the four illustrated in the prior section Alternative Multi Site SAN configurations page 10 lists other possible configurations Designing a Multi Site SAN 9 Table 3 Alternative Multi Site SAN configurations Alternate con
7. clusters and sites can have many more storage systems than are depicted here However the pictures are more focused on the network design Designing the network for the Multi Site SAN T Figure 6 Dual redundant links between two sites Management Group 1 Dual redundant GigE links Figure 7 Dual redundant links between two sites with Failover Manager in logical third site Failover Manager Management Group 1 Dual redundant GigE links 2 Optional redundant path 12 Designing a Multi Site SAN Figure 8 Triangular network with Failover Manager Failover SS Manager Management Group 1 Dual redundant GigE links Figure 9 Hub and spoke network core with redundant links out to each site Management Group 1 Core network hub and spoke Designing the network for the Multi Site SAN 13 Figure 10 Combination full mesh core with triangular links to all sites Management Group 1 Full mesh core network Using multiple subnets You can use multiple subnets with a Multi Site SAN Multiple subnets let you have multiple VIPs one VIP per subnet The advantage of using multiple VIPs is that you can connect to a volume without having to leave the local subnet Alternatively you can assign an application server to a site Application servers assigned to a site connect only to storage systems in the same site For more information see Best practices for implementing the Multi Site SAN network page
8. if Site A is the first preference for connection put the VIP associated to Site A first in the discovery list e You must also log on to the volumes with the default Target Portal setting Using multiple cluster VIPs when connecting to a Multi Site SAN Use the Virtual IP address of the HP P4000 SAN Solution cluster when connecting to volumes In a multiple subnet configuration you must enter both of the VIPs of the multi site cluster on all the application servers In addition all the application servers must have the VIPs listed in the same order A sample Multi Site SAN configuration is shown in Figure 12 page 16 In this configuration the cluster has three sites Site A Site B and Site C Site A is primary Connecting application servers with single or multiple NICs to a Multi Site SAN 1 Oneach application server enter the cluster VIPs in the same order as on the Discovery tab of the iSCSI Initiator Properties window Designing the network for the Multi Site SAN 15 Figure 12 Entering VIPs in a Multi Site SAN configuration iSCSI Initiator Properties xi Favorite Targets volumes and Devices RADIUS General Discovery Targets M Target portals Address IP address Primary Site VIP Site B VIP Site C VIP Add Portal Remove Refresh MISNS servers Name Add Refresh P On the Targets tab select the volume to log on to Click Log On 4 Select the Enable multi path
9. 1 through 10 for the additional NICs Using MPIO with multiple subnets When you are using multiple subnets in a Multi Site SAN the HP P4000 DSM for MPIO or Microsoft DSM will only build O paths to the storage systems that are in the same subnet as the application server See the DSM for MPIO Deployment Guide for more information about MPIO When using VMware ESX 4 or higher and its native MPIO in a Multi Site SAN you cannot configure more than one subnet and VIP Multiple paths cannot be routed across subnets by the ESX ESXi 4 initiator With VMware ESX the preferred configuration is a single subnet and with ESX servers assigned to sites in SAN iQ Setting up application clusters in a Multi Site SAN environment Just as you can set up a Multi Site SAN for data availability even when a complete site is offline you can set up application clusters Microsoft Cluster Server VMware ESX Cluster Linux Cluster and so forth so that the cluster nodes are split between the sites By having the automated failover failback capabilities in the SAN many application cluster technologies can leverage this capability to do stretch application clustering Consult the application server specific information for information about setting up clustering to support this type of failover In general you must pertorm three tasks 1 Set up an application server node in each site 2 Configure the application server to connect to the volumes on the SAN 3
10. icccvesicnienercedsarecainehirene wedinrl ee aetieeeadaeanenen 31 Related informatioNsissise tees vacua eves Rss ea a a N a aE EEE 31 HPS YS ast Ste oer eeen taint cen boss us messi eapanguete aoeiaap autmsnuaeaa aos anon oreen tatunminnedaanees 31 I rrr ean tsa AE ecient nec AN IEEE DE TEN ao een erent eee 32 NG OE E AEA E AE AE ESE AS ENAS A AES E AOE E E 38 Contents 3 1 Designing a Multi Site SAN The Multi Site SAN features enable you to synchronously mirror data between sites automatically You create a Multi Site SAN by configuring equal numbers of storage systems into sites in the software The Multi Site SAN software enables a variety of features that are based on geographic awareness and synchronous replication e Multi Site clusters that can Span up to three sites Span multiple subnets o Have multiple VIPs e Geographical awareness enabled by designating storage systems as members of a particular site e Synchronously replicated mirrored data between sites based on volume data protection level e Site information that ensures that data is mirrored between sites for high availability and disaster recovery e O path preferencing so that application servers connect to storage systems located in the same site e Failover Manager support for automatic failover failback in three site configurations without requiring a physical storage system in the third site e Failover Manager for quorum mana
11. iniri EE E E dle RR E E EOE EA 25 Viewing sites in the CNC 5 atessachice ects bacyemcaicaeaaneen antinontaiseener amentniontnanedad vb nduunonte coeds euneauyintededes 26 Designating a primary SUS issis cg cae ars Geaacctaaitensiatsapinann iter AEE E A EE E aa 27 Adding a Siles earran Ee EE EE E E ected aeecsumeeeaeee 27 Editing ASIE srania nn B EE E E EE RR E EE EERE 27 IAE Te Eo E CE E E E EA 27 Adding storage systems to a Multi Site Cluster ccccccccessssccceeeceeeneeeceeeseeseseeeeeeseneseeeeeeesesneaaeees 28 Adding additional capacity to existing SSS acesseezescvaidensaniccdindemiainolbdiertnastmaeaieabiueeepGnatandes 28 Removing storage systems from a Multi Site Cluster cccccccesecseeeeeeceeseeeececeesneaeeeeseneeeseeeeeeeees 29 To remove the storage systems from the Sit cccccscssccceeeceseneeeceeeeeeneneeeeeescesseeeeeeesetseaaeees 29 Removing servers from a SIE zccucsascslcedcaecetnastiveheseiede Sutnesenexsdadae vneusmebeidecs prndsendnwdeledss ayndvensendexelas 29 3 Support and other resOurces cccccccccccccceccceeesssseeeeeeeseeeeeeeeeeeeeeeaasasaeeeees 30 Gontaching TIP sas sajawivicateavevarssmncaveueaneeialarceaneianiveilonss eeoa mena Ee seoseta 30 Subscription SNC eae coeccareacst iri E sched EAE TE E EE E cece e land EEE 30 HP Insight Remote Support SOM WANS vecaceisictsocsdveccarnsd counedncencsnseindvemseuciodeacermapusoin giceasgmiaaunuetsededs 30 New and changed information in this SiO
12. recommended managers page 19 identifies common Multi Site SAN configurations and the recommended manager contigurations Designing a Multi Site SAN Table 6 Common Multi Site SAN configurations with recommended managers Multi Site SAN configuration Two physical sites one site is primary Two physical sites logical third site Three physical sites cluster spans two sites Three physical sites Manager configuration For four storage systems run e two managers in the primary site e one manager in the secondary site For six storage systems or more run e three managers in the primary site e two managers in the secondary site For two storage systems run e one manager in each site e one failover manager in the logical third site e two managers in each site one failover manager in the logical third site For four storage systems or more run e two managers in each site e one failover manager in the logical third site For two storage systems run e one manager in each site e one failover manager in the third site For four storage systems run e two managers in each site e one failover manager in the third site For three storage systems run e one manager in each site For six or more storage systems run e two managers in each site Number of managers and number Needed to maintain quorum Manager count three Number for quorum two Manager count five Number for quorum
13. set e RAID 1 data mirrored from one disk onto a second disk e RAID 10 mirrored sets of RAID 1 disks e RAID 5 data blocks are distributed across all disks in a RAID set Redundant information is stored as parity distributed across the disks e RAID 50 mirrored sets of RAID 5 disks Number of intact disks required to maintain data integrity in a RAID set The rate at which the RAID configuration rebuilds if a disk is replaced RAID status register remote copy pair remote snapshot remote volume Repair storage system replication level replication priority restripe resync rolling back SAN iQ interface secondary site server Condition of RAID on the storage system e Normal RAID is synchronized and running No action is required e Rebuild A new disk has been inserted in a drive bay and RAID is currently rebuilding No action is required e Degraded RAID is not functioning properly Either a disk needs to be replaced or a replacement disk has been inserted in a drive e Off Data cannot be stored on the storage system The storage system is offline and flashes red in the network window Register individual storage systems to use add on applications Registration requires sending in the storage system serial numbers to purchase the license keys which are then applied to the storage system The primary volume and its related remote volume An identical copy of a primary snapsho
14. to set up clusters that span multiple subnets in the same site The Multi Site SAN software can be used to create clusters that span multiple networks subnets in larger Enterprise data centers The storage systems all reside in the same site However the cluster must be Multi Site if it is to contain storage systems from different subnets Designing the network for the Multi Site SAN Good network design is a critical part of setting up a Multi Site SAN that meets your needs A good Multi Site SAN network encompasses the following attributes e Reliability e High availability e High performance This section contains information about the minimum recommended network design considerations when planning a network to support a Multi Site SAN Best practices for implementing the Multi Site SAN network 10 e Adequate bandwidth Plan for 50 MB sec of bandwidth for each storage system in each site For instance if each site contains five storage systems then you need 250 MB sec throughput In this case that translates into two Gigabit Ethernet links or more e Low round trip latency In order to not impact disk I O to the application server the round trip latency between the sites must be no more than 2 ms e Redundant links Have multiple physical connections media between the sites for redundancy The network should be configured so that a link failure does not cause the Multi Site SAN to go offline Design
15. volume are all created This process takes some minutes Viewing the Multi Site cluster information You can view the completed sites and related information in two places The Cluster tab view shows the sites in relation to the cluster e The Cluster tab view Figure 16 page 22 which shows the sites e The Sites view Figure 17 page 23 which shows detailed information about the storage systems in the cluster Figure 16 Viewing the sites in the cluster Details tab Filey Findy Tasks Help Check for Upgrades rli SAN Status Page Getting Started J Details Use Summary Volume Use System Use Remote Snapshots iSCSI Sessions iSCSI Map View yt Configuration Summary Cluster Gris Available Systems 3 E ManagementGroup_1 mare Cluster_t Events Description Mi Servers 0 S Administration Status Normal Sites n LS Cluster 4 Type Multi Site Performance Monitor Disk Usage HH Storage Systems 3 HHi Volumes 1 and Snapshots 0 Total Space 22 99 GB Available Space 22 01 GB Utilization E 4 Storage System Sites site_1 Primary site_2 system 1 system4 System 2 Systems Cluster Tasks 22 Implementing a Multi Site SAN Figure 17 Viewing the Sites Details tab window Filey Find Tasks Help Check for Upgrades SAN Status Page Getting Saed f Detais mnam Configuration Summary stes
16. 10 If you use multiple subnets within the iSCSI cluster and implement one subnet per site you can take advantage of the following Multi Site SAN features e One Virtual IP address per site iSCSI discovery sessions are terminated on a storage system that is local to the application server in that site e Virtual IP addresses are hosted only on storage systems that reside in the same subnet as the VIP e Read and Write I O requests are forwarded from the application server to a storage system that is in the same site as the server This ensures that the O path is optimal and multiple network hops across the network link between the sites are eliminated Multi Site SAN mapping to subnets VIPs and application servers page 15 shows an example of how the Multi Site SAN setup maps to subnets VIPs and application servers 14 Designing a Multi Site SAN Figure 11 Multi Site SAN mapping to subnets VIPs and application servers f Server Failover Manager 1 Dual redundant GigE links Connecting volumes to multiple subnets in a Multi Site SAN using the Microsoft iSCSI initiator Connecting to volumes in a multiple subnet configuration is similar to connecting to volumes in a single site configuration with the following important differences e You must configure all cluster VIPs for discovery for proper failover failback configuration of a Multi Site SAN List the VIPs in the preferred order of connection For example
17. HP P4000 Multi Site HA DR Solution Pack User Guide HP Part Number AX696 96074 Published September 2011 Edition 5 Abstract This guide contains detailed instructions for designing and implementing the Multi Site SAN features of the HP P4000 SAN Solution The Multi Site SAN features enable you to synchronously and automatically mirror data between geographic sites Topics include designs for network configurations and instructions about implementing the network designs The intended audience is system administrators who manage HP P4000 SAN solutions For the latest version of this guide see the HP website http www hp com support manuals Copyright 2009 2011 Hewlett Packard Development Company L P Confidential computer software Valid license from HP required for possession use or copying Consistent with FAR 12 211 and 12 212 Commercial Computer Software Computer Software Documentation and Technical Data for Commercial Items are licensed to the U S Government under vendor s standard commercial license The information contained herein is subject to change without notice The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services Nothing herein should be construed as constituting an additional warranty HP shall not be liable for technical or editorial errors or omissions contained herein Acknowledgements Microsoft Windows Windows XP an
18. If using multiple subnets in the storage cluster log on to both VIPs in the cluster If you are using the HP P4000 DSM for MPIO see the DSM for MPIO Deployment Guide Setting up application clusters in a Multi Site SAN environment 17 Using the Primary Site designation in two site configurations The Multi Site SAN software supports designating a particular site as Primary so that it does not go offline when the secondary site goes offline or when the network link between sites goes offline This is specific to the two site configuration where without this designation there would be no way for the system to determine which site should remain online in the event of a network separation classically known in the clustering distributed systems world as a split brain system To set up this type of configuration 1 Designate one of the sites as primary 2 Start a majority of managers in the primary site Contact Customer Support for more information Failure modes and recovery steps In general there are three failure modes that a configuration like this can encounter that you should be aware of Failure conditions and resolutions page 18 summarizes the failure conditions and what you should do to rectify the issue Table 5 Failure conditions and resolutions Failure condition Resolution steps Secondary site offline None The primary site will continue to operate Network link between sites fails None The prim
19. Ns and mangers page 7 For information about management groups managers and starting and stopping managers see the chapter Working with Management Groups in the HP P4000 SAN Solution User Guide Fault tolerant manager configurations The SAN iQ software tracks the configuration of managers to ensure that you have a fault tolerant configuration You may encounter messages with warnings or prerequisites you must meet before you can change the managers For example if you create a management group and a Multi Site cluster using two or four storage systems the management group has regular managers running on each storage system plus a Virtual Manager added to the management group If you want to add a Failover Manager or stop a manager on one of the storage systems you must first delete the Virtual Manager from the management group Then you can make the other changes Installing and configuring a Failover Manager 24 If you are using a Multi Site SAN configuration that calls for a Failover Manager you must install the Failover Manager from the SAN iQ Management Software DVD onto a separate server on the network The Failover Manager can run on VMware ESX Server VMware Server VMware Player or Microsoft Hyper V Server For detailed instructions for installing and configuring the Failover Manager see Using Specialized Managers in the HP P4000 SAN Solution User Guide Implementing a Multi Site SAN Best practice Instal
20. String is used for client side authentication when using SNMP Communication between a single sender and a single receiver over a network virtual IP address A highly available address that ensures that if a storage system in a cluster becomes unavailable servers can still access the volume through the other storage systems in the cluster A virtual storage appliance that provides one or more simultaneous storage environments in which SAN iQ may execute as though they were running on the bare iron A manager that is added to a management group but is not started on a storage system until it is needed to regain quorum A logical entity that is made up of storage on one or more storage systems It can be used as raw data storage or it can be formatted with a file system and used by a host or file server For release 7 0 and earlier provide the link between designated volumes and the authentication groups that can access those volumes Not used in release 8 0 and later volume set Two or more volumes used by an application For example you may set up Exchange to use two volumes to support a StorageGroup one for mailbox data and one for logs Those two volumes make a volume set volume size The size of the virtual device communicated to the operating system and the applications VSS Provider HP P4000 VSS Provider is the hardware provider that supports the Volume Shadow Copy Service on the HP P4000 SAN Solution VSS Volume Shadow Copy Servi
21. Tasks Help Check for Upgrades SAN Status Page Getting eared Lf Detais Map View st Configuration Summary Sites 0 HH Available Systems 3 Hf Management Group_1 Name HA E Events E unassigned i Servers 0 E Systems 4 IP Address Model Manager Special Mana RAID Status gm Administration E System 1 10 0 13 246 P4000 VSA ESX Normal Normal Sites e System4 10 0 61 36 DELL2950 Normal Normal os E Paomia Tas System 2 10 0 11 244 P4000 VSA ESX Normal Normal f Storage Systems 3 gt System5 _ 10 0 59 41 DL320s Normal Normal b Volumes 2 and Snapshots 0 Eio Volume_1 0 Lio Volume _2 0 aj ul Tasks When there is a Multi Site cluster in the management group the Sites Details tab shows the site assignments of the storage systems and servers Figure 19 Site assignments in a Multi Site cluster Filey Find Tasks Help Check for Upgrades fait SAN Status Page l LE Getting Started Details Map View st Configuration Summary Sites 2 Hiss Available Systems 3 r 8 ManagementGroup_1 Name HHE Events E site EH Servers 2 E systems 2 IP Address Model Manager Special Mana RAID Status a Administration System 1 10 0 13 246 P4000 VSA ESX Normal Normal im Sites amp system 2 10 0 11 244 P4000 VSA ESX Normal Normal EES Cluster_1
22. ary site will continue to operate Primary site offline If any of the storage systems running managers in the primary site can be brought back online you should do this first 2 If all storage systems in the primary site are lost forever you can use the Recover Quorum command line function to recover quorum in the secondary site manually For more information see Recover quorum operation next in this section Recover quorum operation The Recover Quorum function is introduced with the Multi Site SAN as a way to bring volumes back online in the event that quorum in the management group is lost CAUTION The Recover Quorum function should only be used as a last resort The failed site must be completely failed to use Recover Quorum safely on the remaining site The Recover Quorum command line function performs the following actions 1 Removes all offline managers from the management group 2 Ejects all offline storage systems from the management group 3 The SAN iQ software is modified to prevent any data integrity issues in the event any of the offline storage systems are brought back online Best practices for configuring quorum and managers in a Multi Site SAN environment 18 Configuring the appropriate number of managers in a Multi Site SAN on the appropriate storage systems is an important part of setting up the Multi Site SAN for high availability and fault tolerance Common Multi Site SAN configurations with
23. ate new sites directly in the CMC if you want to add a site to an existing cluster You must have equal numbers of storage systems in each site The Failover Manager can occupy a site by itself 1 Select the Sites node in the navigation window 2 Right click and then select New Site 3 Type in a site name and optional description 4 Optional If you are setting up a primary configuration select the Primary box 5 In the Site Systems section click Add to add storage systems to the site 6 Select the appropriate systems and click OK when you are finished 7 In the Site Servers section click Add to add servers to the site 8 Select the servers and click OK when you are finished 9 Click OK again when you have finished creating the new site The Sites Details tab displays the new site with its storage systems and servers Editing a site You can edit any aspect of the site including e Changing the name and description of the site e Changing the primary designation NOTE Only one site can be primary e Adding or removing systems IMPORTANT All sites must have the same number of storage systems except for the Failover Manager which can reside in a site by itself e Adding or removing servers To edit a site Right click the Sites node in the navigation window and then select Edit Sites Select the site you want to edit and then click Continue Make the desired changes Click OK when you are finish
24. ation full mesh core network with triangular three links between sites Balancing the requirements for high availability during certain types of failures in the Multi Site SAN and the budget associated with the network infrastructure typically dictates the network architecture a customer will choose to implement Obviously the most redundant network typically will cost the most to implement However not implementing redundancy in the Multi Site SAN network significantly curtails the benefits of the Multi Site SAN software Common Multi Site network configurations and failure protection of each page 11 shows the common Multi Site network configurations and the types of failures against which they provide protection Table 4 Common Multi Site network configurations and failure protection of each Network topology Site failure protection Network failure protection Storage system failure protection Dual redundant links Yes with manual Yes Yes between sites intervention Full mesh triangular links Yes Yes Yes between sites Hub amp spoke central core Yes Yes so long as the core Yes does not fail Combo full mesh core with Yes Yes Yes triangular links between sites Sample recommended network configurations for Multi Site SANs Samples of common network configurations for the topologies described in Common Multi Site network configurations and failure protection of each page 11 are illustrated in this section The
25. ce writable space See temporary space 37 Index Symbols 2 site configurations primary site designation in 18 A adding additional capacity to existing sites 28 site 27 storage systems to Multi Site cluster 28 alternative Multi Site SAN configurations 9 application clusters setting up in a Multi Site SAN environment 17 application server connecting to Multi Site SAN 17 application servers assigning to sites 11 B benefits of a Multi Site SAN 4 best practices failover manager 11 implementing Multi Site SAN network 10 installing Failover Manager 25 quorum and manager configuration 18 sites and quorum managers 7 C capacity adding to sites 28 changing cluster type 27 clusters changing from Multi Site to standard 27 creating with Multi Site wizard 21 removing storage systems from Multi Site 29 CMC viewing sites in 26 common Multi Site SAN network designs 11 configuration diagram dual redundant links between 2 sites and Failover Manager in 3rd site 11 triangular network with Failover Manager 11 configurations alternative Multi Site SAN 9 configuring data protection level 5 Failover Manager 24 managers for Multi Site SAN 24 regular managers 24 sites and quorum managers 6 contacting HP 30 converting an existing SAN to a Multi Site SAN 23 creating management group 21 Multi Site clusters and volumes 21 D data protection configuring for high availability 5
26. check box if using MPIO Figure 13 Logging on to volume x Target name ign 2003 10 com lefthandnetworks denexchg 6 denexchgmain IV Automatically restore this connection when the system boots Enable multi path Only select this option if iSCSI multi path software is already installed on your computer OK Cancel 5 Optional If you want this volume to be available after rebooting select the Automatically restore check box 6 Click Advanced to open the Advanced Settings window 7 Configure the Advanced Settings as follows e For Local adaptor select Microsoft iSCSI initiator e For Source IP select the IP address of the storage NIC to connect to the volume e For Target portal leave as Default so that the Discovery list of VIPs is used in the same order on all storage systems 16 Designing a Multi Site SAN Figure 14 Target portal value remains Default Advanced Settings EJ General IPSec Connect by using Local adapter Microsoft iSCSI Initiator v Source IP mam na Target Portal Default x CRC Checksum Data digest Header digest CHAP logon information OK Cancel 8 After setting the values click OK to close the Advanced Settings dialog 9 Click OK again to finish logging on 10 If you want to set the MPIO load balancing policy see the HP P4000 DSM for MPIO Deployment Guide Tl If you have multiple NICs repeat steps
27. cluster wizard After creating the management group the Create a Cluster window of the wizard is displayed 1 Select Multi Site Cluster and then click Next The Create Cluster window opens displaying all of the storage systems you designated for the management group 2 Select all the storage systems targeted for all of the sites you plan to create type a name for the cluster and then click Next Installing the Multi Site SAN 21 Creating sites When creating a new site you first create the site and then assign storage systems to that site Click New to open the New Site window Enter a name for the site and an optional description Optional Make the site primary if appropriate Click Add in the Site Systems section and then select the storage systems for this site Click OK when you have finished creating the site nub UND The Set up Sites window opens displaying the first site created and the remaining unassigned storage systems in the list gt Repeat these steps to create additional sites 7 When you have finished creating sites click Next to continue with the wizard If you want to assign servers to a site you can edit the site to do so 8 Click Add to assign each VIP and Subnet Mask as planned for your site layout NOTE You can have one VIP per subnet 9 Click Next to continue 10 Click Finish when you have finished defining the volume The management group sites Multi Site cluster and the
28. cross storage systems in a cluster A WWN encoded sequence that is obtained from the license key fulfillment website A type of network bonding in which the logical interface uses both NICs simultaneously for data transfer Log files for the storage system are stored both locally on the storage system and are also written to a remote log server This site is on an isolated network and power connection than the other sites However it can be in the same physical location as one of the real sites Also a site for a Failover Manager A collection of one or more storage systems which serves as the container within which you cluster storage systems and create volumes for storage Manager software runs on storage systems within a management group You start managers on designated storage systems to govern the activity of all of the storage systems in the group Management information base A database of managed objects accessed by network management protocols An SNMP MIB is a set of parameters that an SNMP management station can query or set in the SNMP agent of a network device for example a router 33 Multi Site cluster network RAID network window NTP original primary volume overprovisioned cluster parity peer site point in time snapshot preferred interface primary site primary snapshot primary volume quorum RAID device RAID levels RAID quorum RAID rebuild rate 34 Glossary A cluster of storag
29. d Windows NT are U S registered trademarks of Microsoft Corporation Contents TDs te rtivic a PAW Te SAN ea 4 Failover Manager OVErVicW ccceeccccececeeeeeaeeeeeeeceseeeeeeeeeeeeeaaeeeeeeecesseeeeeeeesesaaaeeeeeseeseneeeeeeesenes 4 Regue menis aspiran aes e E aie aaa E E E 4 Designing a Multi Site SAIN ss tecteeesanatesdtesesapteyianteendiesdslaacbuceseeddeteusuapesaubeeadecunonledsadiceateussomawestieidens 4 Configuring data replication for optimal availability and redundancy ccccecesseeeeeeeeteeeeetaees 5 Configuring sites and quorum managers to achieve optimal high availability and redundancy 6 Alfernative setups ieii or aE EEEE EEE E EEE EE EE EEEE EE 9 Designing the network for the Multi Site SAN icscccscisasescavossessonsdsnedsouidedencetenetsetadeedearessavenceneesedes 10 Best practices for implementing the Multi Site SAN network ccceesseeeeeeeeeeeeeteeeeeeeeeeeeneaees 10 Common Multi Site SAIN network designs csiatcccerssessaechincatvaadesiniseesueunta haneanntdhnadeeccaeens 11 Sample recommended network configurations for Multi Site SANS ccccceeeeeeteeeeeeneeeeeeeaees 11 Using multiple subnets sic cose viterdcacet cendensnnedegsadeconenctd eta E desi eaten 14 Setting up application clusters in a Multi Site SAN environment ccccceeesereeeeereeeeeetteeeeeneeeeens 17 Using the Primary Site designation in two site Configurations cccccssseeeceeseeeeeeeteeeeeeeteeeeseeaees 18 Rec
30. e causes the logical interface to use another NIC in the bond until the preferred NIC resumes operation At that point data transfer resumes on the preferred NIC A type of network bonding in which the logical interface performs load balancing of data transmission application managed snapshot authentication group Auto Discover BondO bonding boot device CHAP CLI clone point cluster CMC communication mode community string Configuration Summary data center disaster recovery site disk status 32 Glossary Snapshot of a volume that is taken while the application that is serving that volume is quiesced Because the application is quiesced the data in the snapshot is consistent with the application s view of the data That is no data was in flight or cached waiting to be written For release 7 0 and earlier identifies the client or entity accessing the volume Not used in release 8 0 and later A feature in the CMC that automatically searches for storage systems on the subnet the CMC is connected to Any storage systems it discovers appear in the navigation window on the left side of the CMC Interface created for network interface failover and only appears after configuring for failover Combining physical network interfaces into a single logical interface Compact flash cards from which the storage system boots up Also known as disk on modules or DOMs Challenge Handshake authentication protocol Com
31. e that spans multiple sites up to three A Multi Site cluster must meet at least one of the following conditions e Contain storage systems that reside in two or more sites e Contain storage systems that span subnets e Contain multiple VIPs The cluster can have a single site and the multiple VIPs make it a multi site cluster Synchronous replication mirroring or parity protection on a volume by volume basis Protecting data for a volume across all storage systems in the cluster Network RAID 10 10 1 or 10 2 is required to protect data in an HP P4000 SAN solution Graphically depicts the status of each storage system Storage systems on the network are either available or part of a management group Network Time Protocol The primary volume that fails and then is returned to service An overprovisioned cluster occurs when the total provisioned space of all volumes and snapshots is greater than the physical space available on the cluster This can occur when there are snapshot schedules and or thinly provisioned volumes related to the cluster In RAID 5 redundant information is stored as parity distributed across the disks Parity allows the storage system to use more disk capacity for data storage Absence of a primary site designation makes all the sites peer sites Snapshots that are taken at a specific point in time but an application writing to that volume may not be quiesced Thus data may be in flight or cached and
32. ed ae Deleting a site You would delete a site from a Multi Site cluster when you are either reconfiguring your SAN or recovering from a disaster or other failure When only one site will be left in the cluster deleting a site changes the cluster from a Multi Site cluster to a standard cluster If you then remove the storage system s assigned to that site data that resides on the cluster will restripe Configuring sites 27 Select the Sites node in the navigation window Select the site you want to delete in the Details tab right click and then select Delete Site NOTE If only one site will be left in the cluster the warning shown in Deleting a site that contains a storage system causes this warning page 28 is displayed Figure 20 Deleting a site that contains a storage system causes this warning Centralized Management Console amp s WARNING This operation will cause cluster Cluster_1 to change from a Multi Site cluster to a standard cluster Note A Multi Site cluster has storage systems that are assigned to sites and are balanced across sites or has more than one VIP Are you sure you want to change the cluster type To continue with the operation click OK To exit the operation without making changes click Cancel Ss ca 3 Click OK to delete the site Adding storage systems to a Multi Site cluster After your Multi Site cluster is configured and operating you may want to add
33. ent 17 MPIO with multiple subnets 17 multiple subnets for a Multi Site SAN 14 sites adding 27 adding capacity to 28 assigning servers to configuring for high availability and redundancy 6 deleting 27 designating primary 27 editing 27 map view 26 overview 25 removing servers from 29 removing storage systems from 29 viewing in the CMC 26 storage systems adding to sites 28 removing from a site 29 subnets setting up multiple for a Multi Site SAN 14 setting with MPIO 17 Subscriber s Choice HP 30 support software remote 30 T technical support 1 service locator website 31 U using the Multi Site cluster wizard 23 V viewing sites in the console 26 VIP as feature of Multi Site SAN 14 39 volumes creating with Multi Site SAN wizard 21 W websites HP 31 HP Subscriber s Choice for Business 30 product manuals 31 wizard Multi Site clusters 21 40 Index
34. est practice configuration Network RAID 10 2 2 NOTE 3 sites are supported but are not considered a best practice configuration When to use Network RAID 10 2 Using Network RAID 10 2 offers a level of data protection that enables the Multi Site SAN to sustain a complete failure at one site and still maintain replicated data at the other site For instance with Network RAID 10 2 there are four copies of data for the volume on the SAN In a two site configuration the Multi Site SAN software puts two of the four copies in one site and the remaining two in the other If a site fails the remaining site still has two copies and remains fault tolerant Designing a Multi Site SAN 5 Figure 1 Sample configuration for two site data protection level Network RAID 10 2 Manager Management Group 1 Volumes are configured with Network RAID 10 2 Configuring sites and quorum managers to achieve optimal high availability and redundancy Several recommended site configurations can be used with the Multi Site SAN software These configurations provide varying levels of availability and redundancy Common configurations of Multi Site SANs and mangers page 7 shows the recommended configurations Select the one that best matches your environment Designing a Multi Site SAN In addition to setting up the Multi Site clusters for data replication it is important to set up the SAN managers for quorum correctly to ensure that in the even
35. ew configuration The system can keep track of several configuration changes at once This means you can change configurations even while a volume is in the midst of a different reconfiguration In particular if a reconfiguration was done by accident you don t have to wait until it finishes to change back to the original configuration See Stripe When a storage system goes down and writes continue to a second storage system and the original store comes back up the original storage system needs to recoup the exact data captured by the second storage system Replaces the original volume with a read write copy of a selected snapshot Starting with release 8 0 he new volume retains the same name When you initially set up a storage system using the Configuration Interface the first interface that you configure becomes the interface used for the SAN iQ software communication A site that is less important than the primary site In this setup a minority of managers runs in the secondary site In a two site setup this allows the secondary site to go offline if the network link between the Primary and secondary sites fails Typically the secondary site has a minority or none of the application servers If the primary site fails customers can manually recover quorum in the secondary site An application server that you set up in a management group and then assign volumes to it to provide access to those volumes 35 shared snapshot
36. figuration More than one Multi Site cluster in the management group Description Multiple clusters running within the same management group Details The Multi Site SAN software supports running many clusters in the same management group You simply need to make sure that clusters have the same number of storage systems in each site for that particular cluster More than three sites There are more than three sites in the cluster A particular cluster can only span up to three sites However the Multi Site SAN software supports having more than one cluster The different clusters can span different sites within the same cluster Using Virtual Manager The Virtual Manager capability remains in the product a manual process for recovering quorum The Virtual Manager is used in two site configurations and is not as commonly used as the Failover Manager For more information about the Virtual Manager see the chapter Special Managers in the HP P4000 SAN Solution User Guide Using Remote Copy with Multi Site SAN The cluster contains Remote Copy which like all other SAN iQ features is compatible with Multi Site SAN You can use Remote Copy to replicate data from a Multi Site SAN to a Disaster Recovery or Backup site See the chapter Understanding and Planning Remote Copy in the Remote Copy User Manual Multiple subnet clusters in the same site The Multi Site SAN features can be used
37. from 29 wizard 23 Multi Site SAN alternative configurations 9 common configurations with recommended Failover Manager 18 common network designs 11 converting from an existing SAN 23 designing 4 implementing 20 installing 20 multiple VIPs as feature of 14 overview 4 preparing to implement 20 requirements 4 N network requirements for performance considerations 10 sample configurations for Multi Site SANs 11 network design common designs for Multi Site SAN 11 O overview Failover Manager 4 managers 24 Multi Site SAN 4 sites 25 P performance and network requirements 10 planning preparing to install 20 primary site designating 27 designation in 2 site configurations 18 Q quorum configuration best practices 18 operation to recover 18 sites and quorum managers 7 R recommended network configurations for Multi Site SANs 11 recover quorum operation 18 redundancy site and manager configuration for 6 related documentation 31 remote support software 30 removing servers from a site 29 storage systems from a site 29 storage systems from Multi Site cluster 29 requirements multi site SAN 4 S sample recommended network configurations for Multi Site SANs 11 SAN converting existing to Multi Site 23 server application connecting to Multi Site SAN 17 servers assigning to sites 11 removing from a site 29 setting up application clusters in a Multi Site SAN environm
38. gement if the network connection between the two sites becomes unavailable e Recover quorum via CLI when a site failure also results in losing quorum in the management group Failover Manager overview The Failover Manager is a specialized version of the SAN iQ software designed to run as a virtual appliance in a VMware environment The Failover Manager participates in the management group as a real manager in the system however it performs quorum operations only not data movement operations It is especially useful in a Multi Site SAN configuration to manage quorum for the multi site configuration without requiring additional physical hardware at a site The Failover Manager is supported on VMware Server Workstation and Player For detailed information about installing and configuring the Failover Manager see Using Specialized Managers in the HP P4000 SAN Solution User Guide Requirements e A Multi Site SAN requires a feature key for each storage system in the management group that is also participating in a Multi Site cluster e All sites must have the same number of storage systems Storage systems must be added to or removed from Multi Site clusters equally Designing a Multi Site SAN 4 The Multi Site SAN software offers multiple features and the design flexibility to protect against certain types of failures in the environment Data replication site design and quorum managers combine to protect against certai
39. ing a Multi Site SAN e Assign servers to sites Avoid high latency connections by assigning application servers to the site where the server is located Application servers assigned to a site connect only to storage systems in the same site as follows o Without MPIO With servers set up in the CMC with the load balancing option the system sets up the iSCSI session only to storage systems assigned to the same site o With MPIO and the HP DSM The system sets up iSCSI sessions only to storage systems assigned to the same site o With MPIO and the Microsoft DsM With servers set up in the CMC with the load balancing option the system sets up the iSCSI session only to storage systems assigned to the same site e Use the Failover Manager Unless you have storage systems in three physical sites use a Failover Manager Put the Failover Manager in the third site physical or logical located on a network that is isolated from the other sites and has a different power connection Common Multi Site SAN network designs Based on the Multi Site SAN configuration there are many network designs that can be implemented that solve the redundancy high availability and performance requirements for the Multi Site SAN A few commonly used designs are e Dual redundant links between the sites e Full mesh triangular three redundant links between sites e Hub and spoke central network core with redundant links out to each site e Combin
40. isioning reserves the same amount of space on the SAN as is presented to application servers When using Repair Storage System a ghost storage system acts as a placeholder in the cluster keeping the cluster intact while you repair or replace the storage system Describes all the icons used in the CMC e Items tab displays the icons used to represent virtual items displayed in the CMC e Hardware tab displays the icons that represent the physical storage units Hardware reports display point in time statistics about the performance and health of the storage system its drives and configuration The hostname on a storage system is the user definable name that displays below the storage system icon in the network window It is also visible when the users browse the network Management interface for the SAN iQ software LED lights on the physical storage system so that you can find that system in a rack Internet small computer system interface Like an ordinary SCSI interface iSCSI is standards based and efficiently transmits block level data between a host computer such as a server that hosts Exchange or SQL Server and a target device such as the HP All in One Storage System By carrying SCSI commands over IP networks iSCSI is used to facilitate data transfers over intranets and to manage storage over long distances Improves iSCSI performance and scalability by distributing iSCSI sessions for different volumes evenly a
41. l the Failover Manager on a server in a separate physical location from the SAN sites and then add it as a separate site in the management group Doing so will prevent loss of quorum in a site failure regardless of which single site fails Adding the Failover Manager to the management group and site Adding the Failover Manager to the management group will likely cause the manager configuration to become less than optimal Be sure to change the manager configuration to best reflect the new configuration of the management group See the HP P4000 SAN Solution User Guide Chapter 9 Working with Management Groups the section Optimum Number of Managers 1 Use Find to search for the Failover Manager which appears in the Available Systems pool in the CMC 2 Right click on the Failover Manager and then select Add to Existing Management Group e If there is more than one management group select the correct one from the list that opens e If there is only one management group the Failover Manager is added to the group 3 Select the Sites node in the navigation window Right click and then select New Site 5 In the New Site window type the name and optional description for the Failover Manager site Click Add in the Site Systems section 7 In the Add Systems to Sites window select the Failover Manager from the list and then click OK 8 Click OK on the New Site window The new Failover Manager site appears in the Sites Detai
42. ls tab gt i NOTE You can also add the Failover Manager to an existing site Configuring sites A site is a user designated location in which storage systems are installed Multi Site SAN configurations have multiple sites with storage systems in each site A site can be a logical configuration such as a subnet within the same data center department or application Volumes are replicated across sites which ensures high availability and redundancy You can also assign application servers to sites to avoid high latency connections Application servers assigned to a specific site connect only to storage systems in the same site Sites have the following characteristics e Have equal numbers of storage systems except for the Failover Manager which can reside in a site by itself e Correlate to a geographical location and or a configuration entity such as a subnet or power grid e May be marked as primary e Have a planned number of managers e Have a planned data protection level e Can have application servers assigned to them Configuring sites 25 Viewing sites in the CMC To view sites in the CMC select the Sites node in the navigation window The Sites node is displayed in every management group Typically however the Sites Details tab shows the storage systems as unassigned The site designation has no effect outside of the Multi Site SAN configuration Figure 18 No sites in a standard cluster Filey Find
43. mand line interface An interface comprised of various commands which are used to control operating system responses The snapshot that has two or more volumes related to it A clone point is created when a SmartClone volume is created from a snapshot or from snapshot temporary space A cluster is a grouping of storage systems that create the storage pool from which you create volumes Centralized Management Console See HP P4000 Centralized Management Console The unicast communication among storage systems and application servers The community string acts as an authentication password It identifies hosts that are allowed read only access to the SNMP data The Configuration Summary displays an overview of the volumes snapshots storage systems and iSCSI sessions in the HP P4000 SAN Solution It provides an overview of the storage network broken out by management groups Also known as a Site A data center is a physical location in your environment where application servers SAN storage and network equipment reside In the SAN iQ Multi Site software a data center is typically referred to as a site Similar to a secondary site the disaster recovery site is used to operate the SAN in the event of a disaster Whether the disk is e Active on and participating in RAID e Uninitialized or Inactive On but not participating in RAID e Off or Missing Not on e DMA Off disk unavailable due to faulty hardware or i
44. mbers of storage systems nor will it let you leave unassigned any storage systems currently in the cluster Using the Multi Site cluster wizard Use the Management Groups Clusters and Volumes wizard to convert an existing standard cluster to a Multi Site cluster L i e aad a 30 OND Start the wizard from the Getting Started Launch Pad In the wizard select Existing Management Group and then click Next Select the management group that contains the cluster you want to convert Click Next to open the Create a Cluster window Select Existing Cluster and Convert a Standard Cluster to a Multi Site Cluster and then click Next Click Next to select a specific cluster Select the cluster you want to convert and then click Next Follow the steps in Creating sites page 22 to create the sites using the listed storage systems After creating the sites click Next The wizard opens the Assign Virtual IPs window If the current cluster has a VIP assigned it shows in this window You can either use this VIP or assign new ones according to the network plan for the Multi Site cluster Converting an existing SAN to a Multi Site SAN 23 10 Assign one or more VIPs as planned for your site layout and then click Next The Create Volume window opens with the Skip Volume Creation box checked If you want to create a new volume for your Multi Site cluster clear the box and fill in the volume information Tl Click Next to complete the
45. mproperly seated in the chassis DSM DSM for MPIO failback failover Failover Manager failover recovery frame size full provisioning ghost storage system Graphical Legend hardware reports hostname HP P4000 Centralized Management Console ID LED iSCSI iSCSI load balancing license key Link Aggregation Dynamic Mode log files logical site management group managers MIB Device Specific Module The HP P4000 DSM for MPIO vendor specific DSM that interfaces with the Microsoft MPIO framework After failover the process by which you restore the primary volume and turn the acting primary back into a remote volume The process by which the user transfers operation of the application server over to the remote volume This can be a manual operation a scripted operation or VMware enabled A specialized manager running as a VMware appliance that allows you to place a quorum tie breaker system into a 3rd location in the network to provide for automated failover failback of the Multi Site SAN clusters The Failover Manager is designed to run on VMware ESX Server VMware Server and VMware Player It is installed on hardware separate from the SAN hardware After failover the process by which the user chooses to fail back to the primary volume or to make the acting primary into a permanent primary volume The frame size specifies the size of data packets that are transferred over the network Full prov
46. n types of failures in the environment Some of the common types of failures a Multi Site SAN protects against include data center failures and storage system failures Designing a Multi Site SAN Data center failures e Site power outage e Site network outage e Site disaster fire flood terrorist attack and so forth Individual storage system failures e Power outage e Network outage e System disaster e System failure backplane motherboard RAM CPU Configuring data replication for optimal availability and redundancy The SAN iQ software offers six levels of synchronous replication at a volume level In order to protect the data across sites you must choose a data protection level with a number of mirrors that is at least equal to the number of sites in the configuration For instance if the storage cluster spans three sites then volumes must be configured as Network RAID 10 1 in order to insure that data is the same on each site NOTE Network RAID O Network RAID 5 and Network RAID 6 will not tolerate site failures Data protection levels and the supported number of sites page 5 describes the data replication levels for the Multi Site SAN and associated supported configurations Table 1 Data protection levels and the supported number of sites Data protection level Number of sites supported Network RAID 10 2 Network RAID 10 1 3 NOTE 2 sites are supported but not considered a b
47. o enable enhanced delivery of your HP Warranty HP Care Pack Service or HP contractual support agreement HP Insight Remote Support supplements your monitoring 24x7 to ensure maximum system availability by providing intelligent event diagnosis and automatic secure submission of hardware event notifications to HP which will initiate a fast and accurate resolution based on your product s service level Notifications may be sent to your authorized HP Channel Partner for on site service if configured and available in your country The software is available in two variants e HP Insight Remote Support Standard This software supports server and storage devices and is optimized for environments with 1 50 servers Ideal for customers who can benefit from proactive notification but do not need proactive service delivery and integration with a management platform e HP Insight Remote Support Advanced This software provides comprehensive remote monitoring and proactive service support for nearly all HP servers storage network and SAN environments plus selected non HP servers that have a support obligation with HP It is integrated with HP Systems Insight Manager A dedicated server is recommended to host both HP Systems Insight Manager and HP Insight Remote Support Advanced Details for both versions are available at htto h18004 www 1 hp com products servers management insight remote support overview html To download the software go to Sof
48. over quorum CPISTCHNIONG ciasvnececeinssdauatoehauaadinasaduacsaudonstetenagannsaedaitueratavadaagnonateantaonnraneies 18 Best practices for configuring quorum and managers in a Multi Site SAN environment 18 2 implementa eh Malie SAIN e na 20 Before you NM nse vc Sees ctn crn nee ea soo sect ee cna eee 20 Preparing to install a new Multi Site SAIN ciniicnndcsssteesenasuatadenceauedvavercvavensiandaveiaetaiacee tae 20 Preparing to convert an existing SAN to a Multi Site SAN sssssnenessssesesssssseseessesssersrssesrene 20 Installing the Multi Site SAN oct i ctceeie cexteeneddeotav arb ndetladneeenaieeindaa Aa 20 Creating the management Groupigssleesteushavedlacelsactanaiaendiaselenstacubdesdlasdideateusssganiecyiaantanesdeelies 21 Creating Multi Site clusters and VOlWMES 2s lt icarccineberssendcarceeis doeeteacicediiae eens wentireeineeseeinns 21 Converting an existing SAIN to a Multi Site SAIN czc esceceoiensesseaeedoenieneindestderoencieiidectinmudasdssies 23 PETE QUISIIES 15 lt s1iconaersiasdidsiaaexnneseinid aeusnin alee enceiananeaias EEE E E EE E 23 Configuring INN AS Fc ia dep rrersuac ise sndeoundeeeduiea yeoelonsediesdscssbeansddousiabaphoeresdadoeeiawmiacesiedeeeds 24 OVI CW A ET E E E E A 24 Configuring regular managers sssssensoesseseo enesesse een eeiniaa eae eae eee 24 Installing and configuring a Failover MOMAGET cccccccceeseeeceeeceseseeeeeeeeeeseeseeeeeeeeeteseeeeeeee 24 OMNIA SES sienes
49. remove servers from a site as server use and needs change To remove servers from a site 1 2 3 4 Select the Sites node in the navigation window Select the site from which you want to remove the server Right click and then select Edit Site In the Site Servers section select the server from the list and then click Remove The server is removed from the list Click OK on the Edit Site window A message opens warning that the server will lose its site preference Click OK to continue Removing storage systems from a Multi Site cluster 29 3 Support and other resources Contacting HP For worldwide technical support information see the HP support website http www hp com support Before contacting HP collect the following information e Product model names and numbers e Technical support registration number if applicable e Product serial numbers e Error messages e Operating system type and revision level e Detailed questions Subscription service HP recommends that you register your product at the Subscriber s Choice for Business website http www hp com go e updates After registering you will receive email notification of product enhancements new driver versions firmware updates and other product resources HP Insight Remote Support Software 30 HP strongly recommends that you install HP Insight Remote Support software to complete the installation or upgrade of your product and t
50. storage systems to the cluster for additional capacity or to create a new site While you can add storage systems to the Multi Site cluster at any time you should add them in a way that does not violate the requirements of the Multi Site SAN See Adding a site page 27 if you plan to add the storage systems to a new site in the cluster Adding additional capacity to existing sites Plan the following items according to your overall Multi Site SAN configuration Plan to add the same number of storage systems to each site Obtain feature keys for the new storage systems Plan the IP addresses and locations for the new storage systems to fit into the overall design for your Multi Site SAN To add capacity 28 1 CONAN RYWN Add the license keys to the new storage systems See Registering Advanced Features in the HP P4000 SAN Solution User Guide for more information about license keys Add the new storage systems to the management group Select the management group Sites node in the navigation window Select the site to which you want to add a storage system Right click and then select Edit Site In the Site Systems section click Add to add the storage system Select the storage system from the list and then click OK Click OK to finish adding the storage system to the site Repeat these steps for all the storage systems you are adding 10 Add the storage systems to the Multi Site cluster using the Edit Cl
51. t The remote snapshot is located on the same cluster as the remote volume The volume that resides in the Remote Copy location where the remote snapshots are created The remote volume contains no data It acts as a pointer to tell the system where to make the copy of the primary snapshot The remote volume can be stored in these ways e In the same cluster in the same management group e Ina different cluster in a different management group e Ina different cluster in the same management group Creates a placeholder in the cluster in the form of a ghost storage system that keeps the cluster intact while you remove the storage system to replace a disk or replace the storage system itself and return it to the cluster In Release 8 5 this changes to data protection level Prior to release 8 5 replication level is the term that designated how many copies of data to keep in the cluster Removed in Release 8 5 Prior to Release 8 5 replication priority allowed you to designate whether data availability or redundancy is more important in your configuration Release 8 5 forward defaults to availability This default can be changed using the Cliq Command Line Interface Striped data is stored across all disks in the cluster You might change the configuration of a volume for example change data protection level add a storage system or remove a storage system Because of your change the pages in the volume must be reorganized across the n
52. t groups with only 2 storage systems in the group Management groups with only a 2 site 2 data sites Multi Site Cluster in the group Insert the management software DVD and launch the FOM installer or download the management software DVD from http Awww hp com go p4000downloads To exit this wizard at any time click Cancel To continue click Next net ES Ea NOTE You must have at least one storage system for each site in the Available Systems pool before starting Creating the management group The first part of the wizard creates the management group which includes configuring the optimal number of managers for the initial setup After you have the Multi Site clusters configured you need to review the manager configuration and adjust it according to the Multi Site configuration you have planned See Configuring managers page 24 Creating Multi Site clusters and volumes The path through the Multi Site cluster portion of the wizard follows the steps listed below The steps are described in greater detail in Using the Multi Site cluster wizard page 21 Create a cluster Create a site and then assign storage systems to the site Create the additional sites with storage systems up to a total of three sites Add one or more VIPs depending on the number of subnets you have configured Create volumes using the data protection levels dictated by your Multi Site cluster design MER Using the Multi Site
53. t of a failure the system can be properly recovered Maintaining quorum can be either an automated process or manually recovered by an Administrator Table 2 page 7 summarizes common Multi Site SAN and manager configurations Table 2 Common configurations of Multi Site SANs and mangers Number of sites Cluster site setup Total number of Failover Manager Site types managers of all types three physical sites Cluster spans two sites Min three Max In the third site All sites are peer five two physical sites Cluster spans two sites Min three Max In the logical third site All sites are peer with logical third site five three physical sites Cluster spans three Min three Max Not used All sites are peer sites six two physical sites Cluster spans two sites Min three Max Not used One site is designated five primary Best practice In a cluster that spans multiple sites run the same number of managers in each site In a cluster that spans two sites run a Failover Manager in a third site physical or logical that is not included in the cluster Three physical sites cluster spans two sites Failover Manager in third site page 8 The one exception to this rule is the two site configuration in which one site is configured as primary Two physical sites cluster spans two sites one site is the primary site page 9 In this case run a majority of the managers in the primary site Sample configurations
54. the actual data on the volume may not be consistent with the application s view of the data A preferred interface is the interface within an active backup bond that is used for data transfer during normal operation A site designation assigned by the administrator in the HP P4000 Centralized Management Console A primary site is more important than a secondary site In this setup you would run a majority of managers in the primary site In a two site setup this allows the primary site to stay online even if the network link between the primary and secondary sites fails Typically the primary site has majority all of the application servers In configurations that do not designate a primary site the sites are referred to as peer sites A snapshot of the primary volume which is created in the process of creating a remote snapshot The primary snapshot is located on the same cluster as the primary volume The volume which is being accessed read write by the application server The primary volume is the volume that is backed up with Remote Copy A majority of managers required to be running and communicating with each other in order for the SAN iQ software to function RAID originally redundant array of inexpensive disks now redundant array of independent disks refers to a data storage scheme using multiple hard drives to share or replicate data among the drives Type of RAID configuration e RAID O data striped across disk
55. three Manager count three Number for quorum two Manager count five Number for quorum three Manager count three Number for quorum two Manager count five Number for quorum three Manager count three Number for quorum two Manager count six Number for quorum four Setting up application clusters in a Multi Site SAN environment 19 2 Implementing a Multi Site SAN After you have designed the Multi Site SAN configuration you are ready to implement it Before you begin Install Multi Site SAN feature keys on the storage systems you are going to use Register your storage systems For more information see Registering Advanced Features in the HP P4000 SAN Solution User Guide for information about registering your storage systems Have the following information ready e The layout for storage systems and sites e P addresses subnets and VIPs to use for the Multi Site cluster You can use one VIP per subnet e Optional IP address and subnet for the Failover Manager Preparing to install a new Multi Site SAN After you have finished planning the Multi Site SAN and installed feature keys on the storage systems for the SAN you are ready to begin installation Preparing to convert an existing SAN to a Multi Site SAN Converting an existing SAN to a Multi Site SAN includes planning the site layout and network information along with the following considerations e Do you need to mo
56. tware Depot https h20392 www2 hp com portal swdepot index do Select Insight Remote Support from the menu on the right Support and other resources New and changed information in this edition The following additions and changes have been made for this edition e The following information has been updated o P4000 SAN Solution software and user manuals have been rebranded e Functionality has been added that allows adding servers to sites Related information The following documents and websites provide related information e HP P4000 SAN Solution User Guide You can find these documents from the Manuals page of the HP Business Support Center website http www hp com support manuals In the Storage section select Disk Storage Systems and then select P4000 G2 SAN Solutions HP websites For additional information see the following HP websites e http 7www hp com e http 7www hp com go storage e http www hp com service_ locator e http 7www hp com support manuals e http 7www hp com support downloads New and changed information in this edition 3 Glossary acting primary volume Active Passive Adaptive Load Balancing The following glossary provides definitions of terms used in the SAN iQ software and the HP P4000 SAN Solution The remote volume when it assumes the role of the primary volume in a failover scenario A type of network bonding which in the event of a NIC failur
57. uster window Implementing a Multi Site SAN Removing storage systems from a Multi Site cluster Removing storage systems from a Multi Site cluster affects the capacity of the cluster and the Multi Site configuration Ensure that the capacity remaining after you remove the storage system s is sufficient for the data on the volumes To maintain the Multi Site configuration plan to remove equal numbers of storage systems from each site To remove the storage systems from the site 1 2 3 4 6 7 Select the Sites node in the navigation window Select the site from which you want to remove the storage system Right click and then select Edit Site In the Site Systems section select the storage system from the list and then click Remove The storage system is removed from the list Click OK on the Edit Site window A message opens warning that the Multi Site cluster will change to a standard cluster if you remove the storage system Click OK to continue Repeat these steps to remove storage systems from additional sites NOTE Adding the Failover Manager will likely cause the manager configuration to become less than optimal Be sure to change the manager configuration to best reflect the new configuration of the management group See the section Optimum Number of Managers in the chapter Working with Management Groups in the HP P4000 SAN Solution User Guide Removing servers from a site You can
58. ve remove data from the existing SAN before reconfiguring it e Do you need to purchase additional storage systems to meet the requirement that each site have the same number of storage systems e Do you need to reconfigure your network to take advantage of the Multi Site SAN capabilities See Designing the network for the Multi Site SAN page 10 for detailed information about setting up your network appropriately Installing the Multi Site SAN To install a Multi Site SAN use the Management Groups Clusters and Volumes Wizard 20 Implementing a Multi Site SAN Figure 15 Using the management group wizard to create a Multi Site SAN EE Management Groups Clusters and Volumes Wizard ay Welcome to the Management Groups Clusters and Volumes Wizard F This wizard helps you Create a management group cluster and volume for the first time or Convert a standard cluster to a Multi Site cluster or Add another volume to an existing cluster Before you start this wizard you must Know what information you should have available Discover your systems on the network e g via the Find Systems dialog To ensure the highest availability best practices recommend installing a Failover Manager FOM and using it in a 2 storage system management group configuration If a FOM was discovered on your network it is listed at the bottom of the table above Select it ctrl click and click Next in Managemen
59. wizard 12 Verify the settings for the sites you have just configured 13 Click Close when you finish reviewing the Summary information If you want to assign servers to the site you can edit the site to do so 14 Select the Sites node in the navigation window to view the new site configuration Configuring managers After you have set up your management group cluster and sites you may need to change the manager configuration of your Multi Site SAN You also need to add the Failover Manager in all but one type of configuration Overview The SAN iQ software automatically starts the regular manager on each storage system when creating a management group The number of managers started depends on the number of storage systems in the group and whether you create a Multi Site cluster In some configurations a Virtual Manager is also added to the management group If however you plan to use a Failover Manager instead you must manually install the Failover Manager on a separate server on the network and then add it to the management group as required by the design of your Multi Site SAN We recommend using the Failover Manager instead of the Virtual Manager because of its automated failover failback capabilities Configuring regular managers After you finish creating the management group cluster and sites for your Multi Site SAN review the manager configuration and change it as necessary See Common configurations of Multi Site SA

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