01-19-2010
Please post:
Operating system and version.
Exact crons which are doing the data collection.
If this is unix, I strongly suspect that you are running "sa1" but not running "sa2" (or running some other way of causing rotation of the sar "sann" data files).
When set up correctly your sar data file for the 15th of the month "sa15" should only contain 24 hours data. Without proper maintenance these files grow and the content becomes meaningless (in your case "sa15" probably contains contaconated data for every 15th of the month rather than consecutive days data).
Beware that "sa2" on many systems only keeps 7 days data and you will need to either change "sa2" (it is a shell script), or write something better that suits your situation, and/or make external provision to save the sar "sann" data files. The "sa2" script also stores a human-readble report of the "sann" files which may or may not be useful.
Well worth planning what information you want from the system then configuring the "sar" package to your requirements.
See "man sadc"
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LEARN ABOUT CENTOS
sysstat
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 assign-
ments used to configure sysstat logging. The variables and their meanings are:
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.
COMPRESSAFTER
Number of days after which daily data files are to be compressed, either by gzip or bzip2.
SADC_OPTIONS
Options that should be passed to sadc(8). With these options (see sadc(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.
FILES
/etc/sysconfig/sysstat
AUTHOR
Sebastien Godard (sysstat <at> orange.fr)
SEE ALSO
sadc(8), sa1(8), sa2(8)
http://pagesperso-orange.fr/sebastien.godard/
Linux SEPTEMBER 2010 SYSSTAT(5)