RE: Monitoring Interval Granularity (iostat)

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Fri, 15 Jul 2005 11:21:25 -0700
Message-ID: <960A9B249C99994AA3C7FCA016A0DA8902AA0B00@ussccem08.corp.hds.com>

Mohammed,

Keep in mind that the *first* line of iostat (and vmstat for that matter) is always the average since the last OS restart. My understanding is that iostat/vmstat loading would be minimal and a minute's interval should be fine. DO you use a SAN or NAS? If so, you might also consider their inbuilt tools.

All the best,
John Kanagaraj <><
DB Soft Inc
Phone: 408-970-7002 (W)

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-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of mkb
Sent: Friday, July 15, 2005 9:38 AM
To: oracle-l_at_freelists.org
Subject: Monitoring Interval Granularity (iostat)

I hope this is not too off-topic, but here goes.

I have a linux system (RH AS 3.0) running Oracle 9iR2. I'm monitoring disk usage on our RAID arrays by executing iostat and capturing the output to a file.
Eventually, I'd like to plot the data out and see how the disks are performing.

I'm currently executing iostat every 5 minutes. How would one determine the interval granularity? I guess it would depend on a lot of things.

So for example, if it's very busy take an iostat snapshot every 5 or 10 minutes, say. If it's lightly loaded, take a snapshot every minute perhaps?

Any thoughts?

--

mohammed

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http://www.freelists.org/webpage/oracle-l Received on Fri Jul 15 2005 - 13:23:25 CDT