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Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces
From: |
Juan Quintela |
Subject: |
Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions |
Date: |
Thu, 10 Nov 2011 18:50:49 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) |
Avi Kivity <address@hidden> wrote:
> On 11/09/2011 07:35 PM, Anthony Liguori wrote:
>> On 11/09/2011 11:02 AM, Avi Kivity wrote:
>>> On 11/09/2011 06:39 PM, Anthony Liguori wrote:
>>>>
>>>> Migration with qcow2 is not a supported feature for 1.0. Migration is
>>>> only supported with raw images using coherent shared storage[1].
>>>>
>>>> [1] NFS is only coherent with close-to-open which right now is not
>>>> good enough for migration.
>>>
>>> Say what?
>>
>> Due to block format probing, we read at least the first sector of the
>> disk during start up.
>>
>> Strictly going by what NFS guarantees, since we don't open on the
>> destination *after* as close on the source, we aren't guaranteed to
>> see what's written by the source.
>>
>> In practice, because of block format probing, unless we're using
>> cache=none, the first sector can be out of sync with the source on the
>> destination. If you use cache=none on a Linux client with at least a
>> Linux NFS server, you should be relatively safe.
>>
>
> IMO, this should be a release blocker. qemu 1.0 only supporting
> migration on enterprise storage?
>
> If we have to delay the release for a month to get it right, we should.
> Not that I think we have to.
I kind of agree here, but it is not my call. Patch 1/2 have been used
on RHEL for almost 3 years, so it should be safe (TM).
Later, Juan.
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, (continued)
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Michael S. Tsirkin, 2011/11/09
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/09
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Michael S. Tsirkin, 2011/11/09
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/09
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Kevin Wolf, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Juan Quintela, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Juan Quintela, 2011/11/09
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Avi Kivity, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions,
Juan Quintela <=
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Avi Kivity, 2011/11/12
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/12
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Avi Kivity, 2011/11/12
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Daniel P. Berrange, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Daniel P. Berrange, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/10
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/10