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[Xen-users] High iowait every day at the same time.

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Michael Borokhovich <michaelbor@xxxxxxxxx>
  • Date: Fri, 1 Oct 2010 08:59:12 +0200
  • Delivery-date: Fri, 01 Oct 2010 00:01:45 -0700
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I have a strange and the same problem on two servers. I'm running Xen on two different servers ( Debian 4.0 and 2.6.18-xen Debian 4.0). About 120 guest domains.
Every day exactly at 08:25 AM, high iowait ~99% load starts and lasts for about 50 minutes.

When guests domains are shut down, the problem is not appearing. There is no tasks in crontab on Domain0 and on guest domains.

I tried to figure out the process that is responsible for this iowat but the only thing I found is that kjournald appears in a "D" state from time to time (during that ~1 hour problematic period).

Any help will be appreciated.


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