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Re: [Qemu-devel] KVM call agenda for June 28
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] KVM call agenda for June 28 |
Date: |
Wed, 29 Jun 2011 06:32:39 +0100 |
On Tue, Jun 28, 2011 at 8:41 PM, Marcelo Tosatti <address@hidden> wrote:
> On Tue, Jun 28, 2011 at 02:38:15PM +0100, Stefan Hajnoczi wrote:
>> On Mon, Jun 27, 2011 at 3:32 PM, Juan Quintela <address@hidden> wrote:
>> > Please send in any agenda items you are interested in covering.
>>
>> Live block copy and image streaming:
>> * The differences between Marcelo and Kevin's approaches
>> * Which approach to choose and who can help implement it
>
> After more thinking, i dislike the image metadata approach. Management
> must carry the information anyway, so its pointless to duplicate it
> inside an image format.
I agree with you. It would be a significant change for QEMU users to
deal with block state files just in case they want to use live block
copy/image streaming. Not only would existing management layers need
to be updated but also custom management or provisioning scripts.
> After the discussion today, i think the internal mechanism and interface
> should be different for copy and stream:
>
> block copy
> ----------
>
> With backing files:
>
> 1) base <- sn1 <- sn2
> 2) base <- copy
>
> Without:
>
> 1) source
> 2) destination
>
> Copy is only valid after switch has been performed. Same interface and
> crash recovery characteristics for all image formats.
>
> If management wants to support continuation, it must specify
> blkcopy:sn2:copy on startup.
>
> stream
> ------
>
> 1) base <- remote
> 2) base <- remote <- local
> 3) base <- local
>
> "local" image is always valid. Requires backing file support.
I agree that the modes of operation are different and we should
provide different HMP/QMP APIs for them. Internally I still think
they can share code for the source -> destination copy operation.
Stefan
- [Qemu-devel] KVM call agenda for June 28, Juan Quintela, 2011/06/27
- Re: [Qemu-devel] KVM call agenda for June 28, Stefan Hajnoczi, 2011/06/28
- Re: [Qemu-devel] KVM call agenda for June 28, Marcelo Tosatti, 2011/06/28
- Re: [Qemu-devel] KVM call agenda for June 28,
Stefan Hajnoczi <=
- Re: [Qemu-devel] KVM call agenda for June 28, Kevin Wolf, 2011/06/29
- Re: [Qemu-devel] KVM call agenda for June 28, Stefan Hajnoczi, 2011/06/29
- Re: [Qemu-devel] KVM call agenda for June 28, Marcelo Tosatti, 2011/06/29
- Re: [Qemu-devel] KVM call agenda for June 28, Stefan Hajnoczi, 2011/06/30
- Re: [Qemu-devel] KVM call agenda for June 28, Kevin Wolf, 2011/06/30
- Re: [Qemu-devel] KVM call agenda for June 28, Stefan Hajnoczi, 2011/06/30
- Re: [Qemu-devel] KVM call agenda for June 28, Marcelo Tosatti, 2011/06/30
- Re: [Qemu-devel] KVM call agenda for June 28, Kevin Wolf, 2011/06/30
- Re: [Qemu-devel] KVM call agenda for June 28, Marcelo Tosatti, 2011/06/30
Re: [Qemu-devel] KVM call agenda for June 28, Anthony Liguori, 2011/06/28