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Re: [Xen-users] Scary!!! Lost domU!!!

To: James Pifer <jep@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Scary!!! Lost domU!!!
From: Madison Kelly <linux@xxxxxxxxxxx>
Date: Thu, 31 Dec 2009 19:31:32 -0500
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James Pifer wrote:
I've been on vacation (and still am) but had to work on a couple
problems. I have a couple Citrix servers that are domU's on a sles10sp2
server that has local storage and connects to two ocfs2 volumes.
I tried to restart one of the Citrix servers and it would not restart,
giving an error that the disk was already mounted in a loopback, etc. I
looked at mount and didn't see anything mounted and I had just shut the
domU down. I assumed it had not shut down completely. This domU runs
from the local disk.
So I decided to a restart of the host was in order. I downed the rest of
the domU's, including an oracle server running off one of the ocfs2
clusters. This servers has been being used for the last three weeks from
this location.
After restarting dom0 I started bringing the domU's back up. All of them
came back up fine, except for the oracle server. It gave an error that
the disk files did not exist, and they don't, they aren't there
I checked and double checked history to see if any rm commands had been
given and I didn't find any.
When I restarted, there was an error on one of the local file systems
that said "JDB: barrier-based sync failed...".

Luckily I have a copy of this domU from a few weeks ago BEFORE I copied
it to the ocfs2 volume. What could explain the sudden deletion of a
directory like this?

If this happened on some of the other domU's it could be ugly.
Any advice is appreciated!!!!


I am afraid that I don't have advice, either, but I'd like to second the recommendation of not using filesystems to store VMs. Even for simple performance reasons. I found that dedicated partitions made a world of performance difference.

A note on LVM though; if you cluster it, it won't do LVM snapshots. I found this out late in the game, and had to create secondary partitions in the actual VM to use for snapshotting. I got luck that I had the space to do this, as I hadn't planned for it. That said, it's been a so-far successful setup.

Best of luck, and do share any solution you find please.


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