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

I upgraded in an effort to correct the problem - it was present on the
older kernel as well


Ryan Burke wrote:
>> 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
>> problem.
>> -Ross
> If possible could you downgrade your kernel to 2.6.18 so that it more
> closely matches the officially supported Xen 3.2 kernel? You are at the
> bleeding edge with the kernel you're using and to see if it is a problem
> with Xen 3.2 or that version of the Kernel with Xen a downgrade would be
> helpful.
> Ryan
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