[SUMMARY] Sudden high IO wait time on a quiet disk

From: Wales Wong (wawong@ouhk.edu.hk)
Date: Tue Aug 24 1999 - 01:39:27 CDT

Dear Manager,

I have received two repsonses fron the list:

Thomas Carter (tcarter@memc.com)
Kevin Sheehan (kevin@joltin.com)

It seems that there are no simple answer, except turning on
process accounting.

Thanks for the input and bandwidth.


Original Question:

Dear Managers,

hopefully a simple question ......

A disk, supposed to be very quiet (as shown by iostat -x),
suddenly experiences very high IO wait time. I now need
to locate the problematic process(es). Is there any command
I can use to do so? I have tried lsof, iostat, etc but
the result is not what I need.

Thanks in advance and I will summarize.


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