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Re: kern/53616: dom0 crashes when dumping domU images with vnd+fss
The following reply was made to PR kern/53616; it has been noted by GNATS.
From: mlelstv%serpens.de@localhost (Michael van Elst)
Subject: Re: kern/53616: dom0 crashes when dumping domU images with vnd+fss
Date: Wed, 19 Sep 2018 07:09:00 -0000 (UTC)
kre%munnari.OZ.AU@localhost (Robert Elz) writes:
> It is possible that snapshotting an LVM might work, though I have no idea=
> if we support that - thyat would basically modify the block map undernea=
> the filesystem, and should be possible (if implemented...) Bit not the
> filesystem itself.
Snapshotting LVM is not yet supported.
I also doubt that we support mounting a filesystem or a filesystem+snapshot
by two different kernels at the same time unless it's all read-only.
There is also the caveat that DomU currently always uses a 512byte/sector
geometry but Dom0 uses the real one. For vnd devices that isn't a problem
(modulo performance), but for real disks, LVM or not, it is.
Michael van Elst
"A potential Snark may lurk in every tree."
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