[libvirt] [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions
Avi Kivity
avi at redhat.com
Sat Nov 12 10:25:34 UTC 2011
On 11/11/2011 12:15 PM, Kevin Wolf wrote:
> Am 10.11.2011 22:30, schrieb Anthony Liguori:
> > Live migration with qcow2 or any other image format is just not going to work
> > right now even with proper clustered storage. I think doing a block level flush
> > cache interface and letting block devices decide how to do it is the best approach.
>
> I would really prefer reusing the existing open/close code. It means
> less (duplicated) code, is existing code that is well tested and doesn't
> make migration much of a special case.
>
> If you want to avoid reopening the file on the OS level, we can reopen
> only the topmost layer (i.e. the format, but not the protocol) for now
> and in 1.1 we can use bdrv_reopen().
>
Intuitively I dislike _reopen style interfaces. If the second open
yields different results from the first, does it invalidate any
computations in between?
What's wrong with just delaying the open?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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