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Re: [Qemu-devel] migrating instances from qemu-kvm to qemu
From: |
Serge E. Hallyn |
Subject: |
Re: [Qemu-devel] migrating instances from qemu-kvm to qemu |
Date: |
Wed, 19 Mar 2014 18:37:41 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Quoting Dr. David Alan Gilbert (address@hidden):
> * Serge E. Hallyn (address@hidden) wrote:
>
> > Although, some people are using newer qemu with '-M pc-1.0'. So we'd be
> > stopping thing from migrating to support the people coming from qemu-kvm.
> > Hmm.
>
> What sometimes happens is that you create a VM (lets say with virt-manager)
> on an old installation, and it has the XML file for that VM which I think
> includes the machine type. You upgrade your host or copy your VMs over
> and so you still use the old machine definition, and hence still have the
> -M pc-1.0
Right, but so long as it is a shutdown vm image, it shouldn't matter to
this case whether qemu 1.7 uses the old qemu-kvm cirrus vga ram size, or
the qemu ram size, right?
> Some people have snapshots rather than just disk images taken with particular
> versions and they expect those to be reloadable into newer versions.
Disk snapshots should be fine right? Live snapshots no, but then
I didn't they were actually very well supported anyway. In any case,
they point would remain that if x% of people have snapshots from qemu-kvm,
and the rest have snapshots created using qemu but older machine types,
then whether or not we change the values, either way the other x% or
100-x % will not be able to restore...
So still it seems the only sure way to handle this would be for qemu
to say "old vram size != new vram size; so let me resize the vram".
-serge
- [Qemu-devel] migrating instances from qemu-kvm to qemu, Serge E. Hallyn, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Paolo Bonzini, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Serge E. Hallyn, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Serge E. Hallyn, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Paolo Bonzini, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Dr. David Alan Gilbert, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu,
Serge E. Hallyn <=
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Dr. David Alan Gilbert, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Paolo Bonzini, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Cole Robinson, 2014/03/19
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Serge E. Hallyn, 2014/03/21
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Cole Robinson, 2014/03/21
- Re: [Qemu-devel] migrating instances from qemu-kvm to qemu, Serge E. Hallyn, 2014/03/21