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Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's descrip
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description |
Date: |
Wed, 22 Apr 2015 10:18:03 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Tue, Apr 21, 2015 at 05:28:01PM +0200, Paolo Bonzini wrote:
> On 21/04/2015 03:25, Wen Congyang wrote:
> >> > Please do not introduce "<name>+colo" block drivers. This approach is
> >> > invasive and makes block replication specific to only a few block
> >> > drivers, e.g. NBD or qcow2.
> > NBD is used to connect to secondary qemu, so it must be used. But the
> > primary
> > qemu uses quorum, so the primary disk can be any format.
> > The secondary disk is nbd target, and it can also be any format. The cache
> > disk(active disk/hidden disk) is an empty disk, and it is created before run
> > COLO. The cache disk format is qcow2 now. In theory, it can be ant format
> > which
> > supports backing file. But the driver should be updated to support colo
> > mode.
> >
> > > A cleaner approach is a QMP command or -drive options that work for any
> > > BlockDriverState.
> >
> > OK, I will add a new drive option to avoid use "<name>+colo".
>
> Actually I liked the "foo+colo" names.
>
> These are just internal details of the implementations and the
> primary/secondary disks actually can be any format.
>
> Stefan, what was your worry with the +colo block drivers?
Why does NBD need to know about COLO? It should be possible to use
iSCSI or other protocols too.
Stefan
pgpOgAr0mtKaZ.pgp
Description: PGP signature
- [Qemu-block] [PATCH COLO v3 00/14] Block replication for continuous checkpoints, Wen Congyang, 2015/04/03
- [Qemu-block] [PATCH COLO v3 02/14] quorum: allow ignoring child errors, Wen Congyang, 2015/04/03
- [Qemu-block] [PATCH COLO v3 06/14] NBD client: implement block driver interfaces for block replication, Wen Congyang, 2015/04/03
- [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/03
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Stefan Hajnoczi, 2015/04/20
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/20
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/21
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description,
Stefan Hajnoczi <=
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/22
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Stefan Hajnoczi, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Kevin Wolf, 2015/04/22
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/22
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Kevin Wolf, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Kevin Wolf, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/23