NAME DESCRIPTION
Contents
1. SYSSTAT 5 Linux User s Manual SYSSTAT 5 NAME sysstat sysstat configuration file DESCRIPTION This file is read by sa1 8 and sa2 8 shell scripts from the sysstat s set of tools It consists of a sequence of shell variable assignments used to configure sysstat logging The variables and their meanings are COMPRESSAFTER Number of days after which daily data files are to be compressed The compression program is given in the ZIP variable HISTORY The number of days during which a daily data file or a report should be kept Data files or reports older than this number of days will be removed by the sa2 8 shell script Data files and reports are normally saved in the var log sa directory under the name saDD for data files or sarDD for reports where the DD parameter indicates the current day The number of files actually kept in the var log sa directory may be slightly higher than the HIS TORY value due to the way the sa2 script figures out which files are to be removed see below How the sa2 8 script applies HISTORY value Using a value of 28 keeps a whole month s worth of data How the sa2 8 script applies HISTORY value The sa2 script uses the find command with the mtime option to figure out which files are to be removed The find command interprets this value as N 24 hour periods ignoring any frac tional part This means that the last modified time of a given sa r DD data or report file using a HISTOR2. Y of 1 has to have been modified at least two days ago before it will be removed And for a HISTORY of 28 that would mean 29 days ago To figure out how a HISTORY of 28 is applied in practice we need to consider that the sa2 script that issues the find command to remove the old files typically runs just before mid night on a given system and since the first record from sade can also be written to the previous day s data file thereby moving its modification time up a bit the sa2 script will leave 30 files untouched So for a setting of 28 and counting the data file of the current day there will always be 31 files or 30 files depending on the number of days in a month in the var log sa directory during the majority of a given day E g April 30th 31 files Apr 30th 1st Mar 31th May Ist 30 files May Ist Apr 30th 2nd Yet we can note the following exceptions as inspected at Noon of the given day February 28th 31 files Feb 28th 1st Jan 31st 30th amp 29th March Ist 30 files Mar Ist Feb 28th 2nd Jan 31st amp 30th March 2nd 29 files Mar 1st amp 2nd Feb 28th 3rd Jan 31st March 3rd 28 files Mar Ist 3rd Feb 28th 4th March 4th March 28th 28 files March 29th 29 files March 30th 30 files March 31st 31 files Determining the number of files in March on a leap year is left as an exercise for the reader Linux SEPTEMBER 2010 1 SYSSTAT 5 Linux User s Manual SYSSTAT 5 SADC_OPTIONS Options
3. that should be passed to sade 8 With these options see sade 8 manual page you can select some additional data which are going to be saved in daily data files These options are used only when a new data file is created They will be ignored with an already existing one ZIP Program used to compress data and report files FILES etc sysconfig sysstat AUTHOR Sebastien Godard sysstat lt at gt orange fr SEE ALSO sadc 8 sa1 8 sa2 8 http pagesperso orange fr sebastien godard Linux SEPTEMBER 2010 2
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