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 OPENDARWIN
sadc
sadc(8) BSD System Manager's Manual sadc(8)
NAME
sadc -- system activity data collector
SYNOPSIS
/usr/lib/sa/sadc [-m mode] [t n] [ofile]
DESCRIPTION
The sadc tool is used to collect cumulative system activity data. The sample system data is collected at intervals t seconds apart, in a
loop n times. The binary sample data is written to ofile if specified. Otherwise, the binary data is written to stdout. If the ofile file
does not exist, it is created, otherwise it is truncated.
sadc is intended to be used as the engine behind the sar(1) command, and is not typically invoked on the command line. Two shell scripts,
sa1 and sa2 are provided to drive the typical sampling, saving, and reporting process.
OPTIONS
The following options modify the way data is collected by sadc.
-m mode Modify the collection of system statistics as specified by mode. Currently only one mode is supported.
PPP By default, the collection of ppp network interface statistics is turned off. This is because the number of ppp connec-
tions can be very high, causing the raw data file to grow unexpectedly large, especially when samples are collected at
short intervals. Use the PPP mode to turn the collection back on.
EXAMPLES
/usr/lib/sa/sadc 15 20 /tmp/sample.out
This call collects 20 samples at 15 second intervals. The binary data is written to the /tmp/sample.out file
FILES
/var/log/sa/sadd Default daily activity file that holds the binary sampling data. dd are digits that represent the day of the month.
/usr/lib/sa/sa1 Shell script used to drive the sar data collection.
/usr/lib/sa/sa2 Shell script used to drive the sar data reporting.
SEE ALSO
sa1(8), sa2(8), sar(1), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1)
Mac OS X Jul 25 2003 Mac OS X