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Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's descrip
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description |
Date: |
Fri, 24 Apr 2015 09:58:42 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
* Wen Congyang (address@hidden) wrote:
> On 04/24/2015 03:47 PM, Paolo Bonzini wrote:
> >
> >
> > On 24/04/2015 04:16, Wen Congyang wrote:
> >>>>>> I think the primary shouldn't do any I/O after failover (and the
> >>>>>> secondary should close the NBD server) so it is probably okay to ignore
> >>>>>> the removal for now. Inserting the filter dynamically is probably
> >>>>>> needed though.
> >>>>
> >>>> Or maybe just enabling/disabling?
> >> Hmm, after failover, the secondary qemu should become primary qemu, but we
> >> don't
> >> know the nbd server's IP/port when we execute the secondary qemu. So we
> >> need
> >> to inserting nbd client dynamically after failover.
> >
> > True, but secondary->primary switch is already not supported in v3.
>
> Yes, we should consider it, and support it more easily later.
>
> If we can add a filter dynamically, we can add a filter that's file is nbd
> dynamically after secondary qemu's nbd server is ready. In this case, I think
> there is no need to touch nbd client.
Yes, I think maybe the harder part is getting a copy of the current disk
contents to the new secondary while the new primary is still running.
Dave
>
> Thanks
> Wen Congyang
>
> >
> > Kevin/Stefan, is there a design document somewhere that covers at least
> > static filters?
> >
> > Paolo
> > .
> >
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, (continued)
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Kevin Wolf, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Dr. David Alan Gilbert, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Dr. David Alan Gilbert, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Fam Zheng, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/23
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/24
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/24
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/24
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/24
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/24
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/24
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/24
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Stefan Hajnoczi, 2015/04/27
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/29
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Gonglei, 2015/04/29
- Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description, Stefan Hajnoczi, 2015/04/30
- Re: [Qemu-devel] [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Stefan Hajnoczi, 2015/04/22