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RE: [Xen-users] Dom0 Crashes on High I/O

To: "Henri Cook" <henri@xxxxxxxxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Dom0 Crashes on High I/O
From: "Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>
Date: Fri, 4 Apr 2008 10:10:39 -0400
Cc: Chuck Short <zulcss@xxxxxxxxxx>
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Thread-topic: [Xen-users] Dom0 Crashes on High I/O
Henri Cook wrote:
> Hi all, I have a problem that's very similar to this one - 
> which doesn't appear to have ever been resolved:
> http://lists.xensource.com/archives/html/xen-users/2007-03/msg00112.html
> My dom0 will crash when I try to transfer large amounts of files in
> (e.g. an rsync network backup), when I try to install Windows over HVM
> (at the beginning of the installer when 'installation files are being
> put into folders') and seemingly 'randomly' throughout the day -
> although presumably this could be an instance of high I/O on 
> a DomU that
> I would not be aware of.
> There are no errors, anywhere that I can see - i've checked
> kern.log/syslog/messages/dmesg/xend.log/xend-debug.log
> Please; can anyone shed some light on this? At the moment I 
> can lose the machine up to five times a day and obviously
> can't install windows or anything!
> System is running on Ubuntu Hardy, 2.6.24-14 - in case this is a bug
> with their kernel port i've made a bug on launchpad:
> https://bugs.launchpad.net/ubuntu/+source/xen-3.2/+bug/211751
> Has anyone had this before? How did you solve it?
> Swapping also causes a crash as observed in the initially referenced
> post, but that's probably because it's a high i/o operation. 
> Turning my system's ability to swap off has helped the problem a
> little bit (eliminating that point of failure at least)

Have you tried upgrading your network and storage drivers to
the latest versions?

Have you performed a 'memtest' for several passes over your
entire memory? IO is memory mapped and a bad byte can cause
the server to abend.

Have you tried a disk scan? Especially of your swap storage
to rule out any bad sectors in swap. Swap doesn't have the
bad sector mapping abilities that file systems have.

Try doing all of these and see if it doesn't fix your


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