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Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions |
Date: |
Thu, 10 Nov 2011 10:55:55 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:7.0) Gecko/20110927 Thunderbird/7.0 |
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.
--
error compiling committee.c: too many arguments to function
- 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, Juan Quintela, 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, 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 <=
- 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, 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