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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: |
Sat, 12 Nov 2011 16:36:54 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1 |
On 11/12/2011 03:30 PM, Anthony Liguori wrote:
>> Nor can you yank support for migration this way. Might as well put a
>> big sign on 1.0, "Do Not Use This Release".
>
>
> You're joking, right?
No.
>
> Let's be very clear. Live migration works perfectly fine when you use
> raw images and coherent shared storage.
This is not a realistic setup.
>
> NFS is *not* fully coherent so in order to do live migration with NFS,
> you have to use cache=none.
While putting restrictions on features is not ideal, requiring
cache=none is acceptable as it's that's what's recommended anyway by the
qemu management tool writer's guide.
>
> Live migration does not work with image formats. There's not a simple
> way to make it support image files. So far, no one has put the work
> into making it support image files.
It must be possible, since RHEL's qemu-kvm supports it. I'm sure Kevin
and Juan can make it work.
>
>>
>> Making formal plans and sticking to them is great, but not to the point
>> of ignoring reality.
>
> Why do you think this is an end of the world feature?
>
In 2007 when live migration was added, random restrictions like that
weren't important. 4.5 years later, pulling support for it makes us
look like a joke. Even if it's not technically a regression, in terms
of user's expectations, it is. It's simply impossible to delay it for
six more months, or however long the 1.1 cycle takes.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
- 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, 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, 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 <=
- 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
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Kevin Wolf, 2011/11/11
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/11
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Kevin Wolf, 2011/11/11
- Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions, Anthony Liguori, 2011/11/11