How do sa1/sar time intervals work? - The UNIX and Linux Forums

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How do sa1/sar time intervals work?

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#1 (permalink)

10-23-2008

mschwage

Registered User

Join Date: Jul 2005

Location: Oak Park, IL

Posts: 102

How do sa1/sar time intervals work?

Hi,
I have set up sar on my RedHat and Fedora Linux systems. I am running sa1 from cron:

Code:

0 8-17 * * 1-5 /usr/lib/sa/sa1 1200 3 &

The 1200 and 3 parameters tell sa1 to save data every 1200 seconds (== 20 minutes) and to write 3 times.

When I run sar to observe my data, I'll see something like this:

Code:

# sar -A -f /var/log/sa/sa22 | more
Linux 2.6.21-1.3228.fc7 (opchux0011.comp.optiver.com)   10/22/2008

12:00:01 AM    proc/s
12:10:01 AM      0.03
12:20:01 AM      0.03
12:30:01 AM      0.03
12:40:01 AM      0.03
12:50:01 AM      0.03
01:00:01 AM      0.03
01:10:01 AM      0.18
01:20:01 AM      0.03
01:30:01 AM      0.38
01:40:01 AM      0.03
01:50:01 AM      0.03
...

...What gives? Why is it reporting data every 10 minutes? How come I only see 1 entry every 10 minutes, and not 3? I'm confused...

Thanks.
-mschwage

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