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high ipwait

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trifo

MIS
May 9, 2002
269
HU
Hi!

Is there any method to identify a process which causes extra high iowait?

Sometimes on my application server 1 processor sows up fully busy in iowait state. Thus I think it is a single process causing the symptom.

Can you help me how to identify it?

--Trifo
 
OK, guys, will you please tell me the whole path on which I can obtain the pid of the process which spins the specified disk so much?

--Trifo
 
What about using nmon with T (top processes) and mode (3-Perf or 5-I/O). With a quick search on this forum you will find info regarding nmon.

I've used filemon when an I/O issue was occurring to locate an active file; this may direct you in finding the related process.

Ethan
 
I would use filemon

filemon -O all -o filemon.out ; sleep 120 ; trcstop

Then look for most active files & most active physical volumes

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

 
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