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RE: [Xen-devel] Making snapshot of logical volumes handling HVM domUcaus

To: "Scott Garron" <xen-devel@xxxxxxxxxxxxxxxxxx>, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>
Subject: RE: [Xen-devel] Making snapshot of logical volumes handling HVM domUcauses OOPS and instability
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Sun, 12 Sep 2010 10:20:19 +1000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Daniel Stodden <daniel.stodden@xxxxxxxxxx>
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Thread-index: ActR5g4puE3T28Z/REmiUTYG92hkfAAKc3bA
Thread-topic: [Xen-devel] Making snapshot of logical volumes handling HVM domUcauses OOPS and instability
> >> 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:
> 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
> the snapshot [although, he block-attaches the volume to a domU to do
> 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


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