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Operating Systems Linux Help in monitoring performance problem in Linux Post 302393402 by TonyFullerMalv on Monday 8th of February 2010 04:29:44 PM
Old 02-08-2010
This may be different for your Unix but for Unbuntu sar(1) you can run:
Code:
sar -d

for today's I/O stats or:
Code:
sar -d -f /var/log/sysstat/sa16

for the I/O stats from the 16th.
The simple thing to look for is if the figures for one volume are worse than the others and may benefit from being moved to a dedicated disk or even onto a striped volume?


Also take a look at:
Code:
sar -n ALL

for network device stats.

The other one to look at is:
Code:
sar -q

and see if the run queue size (runq-sz) gets larger when the I/O stats are at there worse.
 

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SA2(8)								Linux User's Manual							    SA2(8)

NAME
sa2 - Write a daily report in the /var/log/sa directory. SYNOPSIS
/usr/lib/sa/sa2 DESCRIPTION
The sa2 command is a shell procedure variant of the sar command which writes a daily report in the /var/log/sa/sardd file, where the dd parameter indicates the current day. The sa2 command handles all of the flags and parameters of the sar command. The sa2 command is designed to be started automatically by the cron command. EXAMPLES
To run the sa2 command daily, place the following entry in your root or adm crontab file: 5 19 * * 1-5 /usr/lib/sa/sa2 -A & This will generate a daily report called /var/log/sa/sardd It will also remove reports more than one week old. FILES
/var/log/sa/sardd Indicate the daily report file, where the dd parameter is a number representing the day of the month. AUTHOR
Sebastien Godard <sebastien.godard@wanadoo.fr> SEE ALSO
sar(1), sadc(8), sa1(8), mpstat(1), iostat(1), vmstat(8) http://perso.wanadoo.fr/sebastien.godard/ Linux DECEMBER 1999 SA2(8)
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