[CentOS] Xen VMs: regular filesystem corruption

Fri Oct 12 19:37:51 UTC 2007
Stephen John Smoogen <smooge at gmail.com>

On 10/12/07, Kai Schaetzl <maillists at conactive.com> wrote:
> It seems that Xen VMs are subject to file system corruption under certain
> conditions. I find that often when I reboot or shutdown a VM the
> filesystem is corrupted after that and the VM no longer usable. The xm
> create then fails with some Python errors and an eventual
> Runtime Error: unable to read filesystem
> No handlers could be found for logger "xend".
> Error: boot loader didn't return any data.
> and I have to throw it away as there doesn't seem a way to fix that (or is
> there?).
> I use files for storing the VMs. There is enough space on the drive. The
> problem seems to happen when I reboot the machine from within itself, not
> each time, but almost each time. When I shut it down with CTRL+ALT+DEL or
> with the Shutdown button it doesn't seem to happen.
> I also find that sometimes a good VM will start up and crash early with a
> kernel panic, but start up just fine when I try a second or third time.
> Most often this happened after a new installation on the first reboot.
> Anyone else seen this or known how to fix that?

I have not seen this... and my setup seems similar to yours. I have
been building and rebuilding xen boxes, rebooting and running them
quite a bit. I would first suspect dodgy hardware.

Stephen J Smoogen. -- CSIRT/Linux System Administrator
How far that little candle throws his beams! So shines a good deed
in a naughty world. = Shakespeare. "The Merchant of Venice"