Dell PowerConnect W-Airwave 7.4 Sizing Guide
Contents
1. and Warning ICONS ii ie 5 OTR ch BEVEL SUDDO EE 6 Chapter 1 Selecting Your Hardware Components i ee 7 CPU Memory and Storage Mat 7 Choosing Your CPU e 8 Choosndg Your Mena 9 Choosing Your RAID Controller ii 9 RAID Configuration Informatnon a 9 200 Devices and BeloW ei 9 II 9 1000 DOYICO Starr 9 e Ne 9 EE eebe EE 9 5 000 Devices Non SSD Drves ENEE 9 5 000 Devices SSD DIIVES i 10 Choosing Your Hard Drves 10 SEG E EEE EER 10 Chapter 2 Configuring Your HardWare i 11 CPU 11 Mee den e o tance at ser A N 11 Filesystem COUN EE 11 Chapter 3 Virtualization and Scalability ccc ccecsssscsssessesecsssecsesecseesesseseesesessesesesesensesnseneneess 13 VirtualizatiO liana 13 Scalability ASSUMPtIONS E 13 Appendix A Sizing a Master Console And FailOVEr 15 VE On E 15 lege 15 Dell PowerConnect W AirWave Server Sizing Guide 3 4 Dell PowerConnect W AirWave Server Sizing Guide Preface This preface provides an overview of this guide a list of all documentation available for AirWave 7 4 including contact information for Dell and includes the following sections Document Organization on page 5 Note Caution and Warning Icons on page 5 Contacting Support on page 6 Document Organization This document provides guidelines for purchasing new hardware which hosts AirWave 4 NOTE De2. K NOTE Software RAID and SATA drives are NOT SUPPORTED for any configuration of AirWave RAID Configuration Information For RAID 1 0 Dedicated Hardware RAID controller with caching and battery backup or non volatile NV cache RAID controller should be configured for Write Back caching with battery backup unless NVcache is selected then Force Write Back without Battery backup is recommended Individual Drive Caching should be enabled Ensure that all disks are assigned and configured to a single volume CAUTION Improper RAID configuration can result in drastically reduced server performance 200 Devices and Below AirWave 100 and 200 models perform well on a single fast spindle speed disk 500 Devices RAID 1 0 configuration of four 4 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 256MB of cache and battery backup 1 000 Devices RAID 1 0 configuration of four 4 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 256MB of cache and battery backup 1 750 Devices RAID 1 0 configuration of six to eight 6 8 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 512MB of cache and battery backup 2 500 Devices RAID 1 0 configuration of six to eight 6 8 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 1GB of cache and battery backup 5 000 D
3. and swap when partitioning the virtual disk Scalability Assumptions Using the specs outlined in Table 3 scalability tests are based on the following assumptions Deviations from these assumptions can impact overall scalability of your AirWave server Table 6 Wireless Scalability Test Values Category Average density of client devices per access point Device configuration auditing interval Up Down status polling period minutes User data polling period minutes Thin AP discovery period minutes Device to device link polling period minutes Device bandwidth polling period minutes 802 11 counters polling period minutes Rogue AP and device location data polling period minutes CDP neighbor data polling period minutes NOTE Auditing more than once a day can have a tremendous impact on scalability Dell PowerConnect W AirWave 7 4 Server Sizing Guide Virtualization and Scalability 13 Table 7 Wired Scalability Test Values Category VENT Ratio of switches routers to access points 6 pearen Reset ome er teree rpm E ERC Table 8 VisualRF Scalability Test Values Category VELE Average floor plan size feet 62 500 Number of access points per floor plan 200 Number of clients per floor plan mm Number of attenuation grid cells per floor plan 2 500 20 Number Rogue devices per floor plan AMP Synchronization timer minutes Ea Rogue location timer minutes Location calculation timer min max numbe
4. D 1 0 is still recommended for SSD deployments to allow for the best overall redudancy and performance Any parity based RAID 5 6 etc is not recommended For additional information please contact Dell support at support dell com 10 Selecting Your Hardware Components Dell PowerConnect W AirWave 7 4 Server Sizing Guide Chapter 2 Configuring Your Hardware This chapter explains sizing information for the following topics CPU Configuration on page 11 Disk Partitioning on page 11 Filesystem Configuration on page 11 CPU Configuration Ensure that Power Management is configured for Maximum Performance By default most vendors configure BIOS to an eco friendly setting Ensure that Memory Operating Mode is configured to Optimizer Mode if available Disk Partitioning Dell PowerConnect W AirWave 7 4 automatically partitions the disk subsystem upon installation You can override these values lable 5 below lists the default partitioning and provides guidance for more advanced scenarios Table 5 Default Partitions Default Partitions Size Remainder of disk space Filesystem Configuration For Dell PowerConnect W AirWave 7 4 the NOOP File I O scheduler provides the best random write performance If you are running Airwave 7 2 or newer Airwave should automatically manage this setting for you To check the currently assigned scheduler if sda is not your device name please replace with the correct d
5. Dell PowerConnect W AirWave 7 4 Server Sizing Guide Copyright 2011 Aruba Networks Inc Aruba Networks trademarks include amp Al TWAaVEe Aruba Networks Aruba Wireless Networks the registered Aruba the Mobile Edge Company logo and Aruba Mobility Management System Dell the DELL logo and PowerConnect are trademarks of Dell Inc All rights reserved Specifications in this manual are subject to change without notice Originated in the USA All other trademarks are the property of their respective owners Open Source Code Certain Aruba products include Open Source software code developed by third parties including software code subject to the GNU General Public License GPL GNU Lesser General Public License LGPL or other Open Source Licenses The Open Source code used can be found at this site http www arubanetworks com open_source Legal Notice The use of Aruba Networks Inc switching platforms and software by all individuals or corporations to terminate other vendors VPN client devices constitutes complete acceptance of liability by that individual or corporation for this action and indemnifies in full Aruba Networks Inc from any and all legal actions that might be taken against it with respect to infringement of copyright on behalf of those vendors Dell PowerConnect W AirWave 7 4 Server Sizing Guide 0510830 03 December 2011 Contents Nett 5 Document OrganizatioN EE 5 Note Caution
6. Ensure that the disk subsystem can sustain these 4KB random write rates Sustained sequential write rates will not help because Dell PowerConnect W AirWave writes are primarily random Dell PowerConnect W AirWave 7 4 Server Sizing Guide Selecting Your Hardware Components 7 The following table lists the minimum specifications required to run AirWave Table 4 Minimum CPU Memory and Storage Sustained Managed poy Class Min Clock py AirWave AirWave I0Ps Sedans Devices Speed GHz Memory Storage Performance 9 4KB random write Pilot 1 25 Single Quad Core 3 1 4 GB 75 GB 30 1 15K SAS APs Intel Xeon 13 2100 Single Quad Core 3 1 6 GB 15 GB 1 15K SAS Intel Xeon E3 1220 200 Single Quad Core 3 3 6 GB 15 GB 120 1 15K SAS Intel Xeon E3 1240 Single Quad Core 3 2 8 GB 15 GB 300 4 15K SAS in Intel Xeon W3670 RAID 1 0 Single Quad Core 3 6 12 GB 150 GB 4 15K SAS in Intel Xeon X5687 RAID 1 0 1 750 Single Quad Core 3 6 18 GB 225 GB 6 15K SAS in Intel Xeon X5687 RAID 1 0 2 500 Dual Quad Core 3 6 2 24 GB 300 GB 6 15K SAS in Intel Xeon X5687 RAID 1 0 Dual Hex Core 3 46 2 48 GB 450 GB 3 000 16 15K SAS in Intel Xeon X5690 RAID 1 0 Dell PowerConnect W AirWave includes the 64 bit CentOS operating system based on Red Hat Enterprise Linux RHEL and is installed by default 4 NOTE If you choose to install RHEL instead of the supplied CentOS you will need to purchase your own RHEL license and support separatel
7. Your Hardware Components E This overview chapter includes the following topics CPU Memory and Storage Matrix on page 7 Choosing Your CPU on page 8 Choosing Your Memory on page 9 Choosing Your RAID Controller on page 9 Choosing Your Hard Drives on page 10 CPU Memory and Storage Matrix The following table lists the recommended specifications for optimum Dell PowerConnect W AirWave server performance Table 3 Recommended CPU Memory and Storage i SITES TTI uni Managed oer AirWave AirWave IOPs mun RISE l CPU Class Speed CPUs Configura Devices GHz Memory Storage Performance tion 4KB random write Pilot 1 25 Single Quad Core 3 1 8 GB 75 GB 30 1 15K SAS APs Intel Xeon 13 2100 Single Quad Core 3 1 8 GB 75 GB 1 15K SAS Intel Xeon E3 1220 200 Single Quad Core 3 3 8 GB 75 GB 120 1 15K SAS Intel Xeon E3 1240 Single Quad Core 3 2 12 GB 75 GB 300 4 15K SAS in Intel Xeon W3670 RAID 1 0 Single Quad Core 16 GB 187 GB 6 15K SAS in Intel Xeon X5687 RAID 1 0 1 750 Single Quad Core 24 GB 275 GB 8 15K SAS in Intel Xeon X5687 RAID 1 0 2 500 Dual Quad Core 3 6 2 32GB 36GB 375 GB 8 15K SAS in Intel Xeon X5687 optimized RAID 1 0 Dual Hex Core Intel 3 46 2 64 GB 72GB 600 GB 3 000 16 15K SAS Xeon X5690 optimized in RAID 1 0 Optimized memory can vary depending on the vendor configuration For more information contact Dell support at support dell com NOTE
8. e today Serial ATA and 10K SAS are vastly outperformed by 15K SAS and should not be used in an AirWave server You will need to select the appropriately sized hard drive to meet your desired storage volume after taking into account RAID 1 0 reduction on overall storage capacity RAID 1 0 reduces your single volume available drive space by 1 2 because of the redundancy introduced An example would be 16x 146GB 15K SAS hard drives in a RAID 1 0 volume will result in approximately 1 1 TB of storage space 16 146GB 2 SSDs vs 15K SAS Solid State Drives are becoming more affordable and are being offered as a high performance drive option by many vendors SSDs offer performance that far outstrips 15K SAS but at a significant cost premium Dell PowerConnect W AirWave supports deployment on SSD based storage arrays and can take advantage of the high speed disk access and stellar random write performance To select an appropriate SSD you ll want to ensure that the SSD is classified as Enterprise class This generally indicates a drive that uses Single Level Cell SLC technology versus Multi Level Cell MLC technology SLC technology is required for an AirWave server to avoid unexpected write exhaustion and or poor performance due to write amplification Confirm with your vendor prior to purchasing SSDs that their offerings are appropriate for a 24 7 sustained high random write database server and are not a consumer grade SSD In general RAI
9. evice name cat sys block sda queue scheduler noop anticipatory deadline cfq Sample Output To configure noop as your preferred scheduler echo noop gt sys block sda queue scheduler And confirm that your change has been applied cat sys block sda queue scheduler noop anticipatory deadline cfq Expected Output Dell PowerConnect W AirWave 7 4 Server Sizing Guide Configuring Your Hardware 11 12 Configuring Your Hardware Dell PowerConnect W AirWave 7 4 Server Sizing Guide Chapter 3 Virtualization and Scalability E This chapter includes the following topics Virtualization on page 13 Scalability Assumptions on page 13 Virtualization Dell PowerConnect W AirWave can run in a VMWare and Xen virtualized environment To ensure scalability dedicate the processing and memory You must also ensure that the disk subsystem can maintain the IOPS throughput as detailed below Most virtualized environments use a shared disk subsystem assuming that each application will have bursts of I O without a sustained high I O throughput AirWave requires a continuous sustained high data I O rate For virtualized environment use dedicated hardware If you are using the specifications outlined in lable 3 the hardware for virtualization should exceed these specifications by 20 NOTE A 20 increase buffer is recommended for virtualized environments Ensure you allocate enough extra disk space for the OS
10. evices Non SSD Drives RAID 1 0 configuration of sixteen 16 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 1GB of cache and battery backup Dell PowerConnect W AirWave 7 4 Server Sizing Guide Selecting Your Hardware Components 9 5 000 Devices SSD Drives AWMS 2 500 5 000 device installations with SSDs require Single Level Cell SLC Enterprise class SSD drives CAUTION Do not use Multi Level Cell MLC Consumer class drives Use of MLC drives can result in drastically reduced SSD drive lifespan and data loss volume failure due to write exhaustion A minimum of six 6 Enterprise SSDs in a RAID 1 0 configuration are required Please see CPU Memory and Storage Matrix on page 7 for minimum needed storage capacity information Eight 8 or more SSDs in a RAID 1 0 configuration are recommended The target random write 4KB IOP Performance is at minimum 3 000 sustained IOPS for 5 000 device monitoring The actual disk IOP requirement can vary depending on the configuration of the AirWave server K NOTE If you have any questions regarding hardware compatibility or selection contact Dell support at support dell com 4 NOTE AirWave servers servicing more than 2 500 devices require 64 bit OS and AirWave 7 1 or higher Do not use software RAID systems or SATA disk drives Choosing Your Hard Drives 15K SAS drives are the highest performance spinning platter drives availabl
11. ll PowerConnect W Series AirWave Wireless Management Suite AWMS AirWave and AirWave Management Platform AMP refer to the same product set and are used interchangeably Table 1 Document Organization and Purposes Chapter Description Chapter 1 Selecting Your Hardware Provides an overview of the sizing information Components on page 7 Chapter 2 Configuring Your Hardware on Details information about the CPU Disk and file system configuration of page 11 AirWave Chapter 3 Virtualization and Scalability on Discusses virtual machines and scaling of AirWave page 13 Appendix A Sizing a Master Console And Includes specifications for Master Console and Failover Failover on page 15 Note Caution and Warning Icons This document uses the following note caution and warning icons to emphasize advisories for certain actions configurations or concepts K NOTE Indicates helpful suggestions pertinent information and important things to remember CAUTION Indicates a risk of damage to your hardware or loss of data A N WARNING Indicates a risk of personal injury or death Dell PowerConnect W AirWave 7 4 Server Sizing Guide Preface 5 Contacting Support Table 2 Web Support Web Support Main Website dell com Support Website support dell com Documentation Website support dell com manuals 6 Preface Dell PowerConnect W AirWave 7 4 Server Sizing Guide Chapter 1 Selecting
12. r of samples 90 360 3 14 Virtualization and Scalability Dell PowerConnect W AirWave 7 4 Server Sizing Guide Appendix A Sizing a Master Console and Failover Master Console Table 9 Master Console Specifications Environment Clock Total i CPU Class Speed CPU Size Cores GHz Memory Disk Subsystem Small 2 3 Quad Core Intel 3 6 12 GB 4 73GB 15K RPM RAID 1 0 146 servers Xeon X5687 GB of usable disk space Large gt 3 Quad Core Intel 3 6 2 24 GB 6 146GB 15K RPM RAID 1 0 438 servers Xeon X5687 GB of usable disk space Failover Server The Failover server should be as powerful as the most powerful AMP server that it is monitoring to ensure smooth operation in a failover situation Dell PowerConnect W AirWave 7 4 Server Sizing Guide Sizing a Master Console and Failover 15 16 Sizing a Master Console and Failover Dell PowerConnect W AirWave 7 4 Server Sizing Guide
13. y Your hardware should incorporate margin for WLAN expansion as well as future AirWave features and modules These recommended specifications are formulated to keep AirWave running on the same hardware platform for up to three years Factors which influence the processing requirements for your AirWave server How many devices will the server manage How often will AMP communicate with these devices E NOTE To ensure hardware capability purchase server hardware that is certified to be compatible with Red Hat Enterprise Linux 5 RHELB Choosing Your CPU For most Dell PowerConnect W AirWave installations select high performance Xeon X or W series based CPUs Scalability testing uses Intel based hardware at this time See Table 3 for recommendations on CPU selection based on clock speed and core type 8 Selecting Your Hardware Components Dell PowerConnect W AirWave 7 4 Server Sizing Guide Choosing Your Memory Dell PowerConnect W AirWave s memory recommendations scale linearly with the managed device count With AirWave servers running at full load for those device counts with a large number of floorplans the recommended memory usually results in best overall performance Best performance is defined by minimal disk reads due to sufficient caching thus allowing for maximum disk write performance and minimal CPU I O wait time Choosing Your RAID Controller RAID 1 0 is the ONLY supported RAID configuration for AirWave
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