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

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Michael Borokhovich wrote:

> I have a strange and the same problem on two servers. I'm running 
> Xen on two different servers (2.6.18.8-xen 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.
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.
If you have a lot of guests all firing up at the same time, then that 
could well saturate your I/O and make it all slow down.
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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