RE: [Xen-devel] Making snapshot of logical volumes handling HVM domUcauses OOPS and instability

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> >> This post seems to be eerily similar to the problem I'm
> >> experiencing.  http:[...]xen-devel/2010-09/msg00169.html
> >
> > Aside from udev being involved, the symptom looks quite different.
> 
> I suppose that's true, but he mentions in this post:
> 
>
http://lists.xensource.com/archives/html/xen-devel/2010-09/msg00286.html
> 
> that lvcreate and udev are hanging while creating a snapshot volume.
> That's the reason I thought it was similar.  (That, and he seems to do
> backups in a similar way that I do:  creates a snapshot, makes a copy
of
> the snapshot [although, he block-attaches the volume to a domU to do
it
> whereas I just use dom0], then removes the snapshot.)
> 

That was me. While it doesn't rule out that the block-attach is causing
the problem, the hang is happening in the lvcreate in my script. My
other theory is that the block-detach is hanging something which means
the subsequent lvcreate can't progress so I see the hang there.

Unfortunately I don't have a machine I can burn to play with this so I
can't test it much, and it breaks the entire Dom0 so it's a bit of a big
deal.

James

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