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

[Madison Kelly <linux@xxxxxxxxxxx>]

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
> anymore. 
>
> 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!!!!
>
> James
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.

Madi

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