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

  • To: Simon Hobson <linux@xxxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Jeff Sturm <jeff.sturm@xxxxxxxxxx>
  • Date: Fri, 1 Oct 2010 15:34:53 -0400
  • Cc:
  • Delivery-date: Fri, 01 Oct 2010 12:36:57 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: ActhOR6Bt28H5riKTO28PltAIx1jKgAZXD/w
  • Thread-topic: [Xen-users] High iowait every day at the same time.

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Simon Hobson
> Sent: Friday, October 01, 2010 3:18 AM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] High iowait every day at the same time.
> Michael Borokhovich wrote:
> >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
> >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.
> By default, Debian runs a bunch of tasks at 6:25, have a look in
> /etc/cron.* and /etc/crontab. I see you are in a +2 timezone, so that
would make 6:25
> into 8:25 by my reckoning.

We don't run Debian but have had to make similar adjustments.  On CentOS
for instance, remove the "mlocate" package.

Log rotation still runs daily on our domU hosts--I've considered
staggering the times so they don't all run at 4 AM.

(Seriously, is there a Linux OS designed for virtualization.  No matter
which I've started with, I end up stripping them down to the essentials.
I've been meaning to take a look at Amazon's Linux AMI for EC2 to see
how it measures up.)


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