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Vztop shows a high iowait CPU % periodically, is it reasonable? [message #28362]

Fri, 14 March 2008 16:44

yoolee
Messages: 23
Registered: November 2007

Junior Member

Hi, All
I am running 250 VEs on a Debian host.
The kernel is ovzkernel-2.6.18-enterprise.
There is a Quad core 64-bit CPU in my box.

Periodically the CPU iowait % reaches nearly 100%,
the situation lasts for several seconds and the CPU iowait
turns to 0%.

Actually I don't issue any I/O tasks in VEs and HN.

Is it reasonable, or is there any tool for monitoring the
I/O operations in VE?

Thanks!

[Updated on: Fri, 14 March 2008 16:46]

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Re: Vztop shows a high iowait CPU % periodically, is it reasonable? [message #28363 is a reply to message #28362]

Fri, 14 March 2008 16:50

aTan
Messages: 29
Registered: March 2008

Junior Member

iostat or dstat?

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Re: Vztop shows a high iowait CPU % periodically, is it reasonable? [message #28393 is a reply to message #28362]

Mon, 17 March 2008 04:38

yoolee
Messages: 23
Registered: November 2007

Junior Member

I found the %iowait is 7.69 since boot. Is it reasonable?
The output of iostat is:

avg-cpu: %user %nice %system %iowait %steal %idle
0.12 0.54 0.76 7.69 0.00 90.90

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 24.09 193.88 166.73 49892271 42906536

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