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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: Thu, 30 Apr 2015 15:56:44 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

On Wed, Apr 29, 2015 at 04:37:49PM +0800, Gonglei wrote:
> On 2015/4/29 16:29, Paolo Bonzini wrote:
> > 
> > 
> > On 27/04/2015 11:37, Stefan Hajnoczi wrote:
> >>>> But it's only for the failover case.  Quorum (or a new 
> >>>> block/colo.c driver or filter) is fine for normal colo 
> >>>> operation.
> >> Perhaps this patch series should mirror the Secondary's disk to a 
> >> Backup Secondary so that the system can be protected very quickly 
> >> after failover.
> >>
> >> I think anyone serious about fault tolerance would deploy a Backup
> >>  Secondary, otherwise the system cannot survive two failures
> >> unless a human administrator is lucky/fast enough to set up a new 
> >> Secondary.
> > 
> > Let's do one thing at a time.  Otherwise nothing of this is going to
> > be ever completed...
> > 
> Yes, and the continuous backup feature is on our TODO list. We hope
> this series (including basic functions and  COLO framework) can be
> upstream first.

That's fine, I just wanted to make sure you have the issue in mind.

Stefan

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