This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


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

To: Simon Hobson <linux@xxxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] High iowait every day at the same time.
From: Jeff Sturm <jeff.sturm@xxxxxxxxxx>
Date: Fri, 1 Oct 2010 15:34:53 -0400
Delivery-date: Fri, 01 Oct 2010 12:36:57 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <p0624080ac8cb3ae61488@xxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <AANLkTikN4r4LaoF3n8ePgZrb5TcxQyDLnO1poG2cPK4e@xxxxxxxxxxxxxx> <p0624080ac8cb3ae61488@xxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
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.)


Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>