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Re: [Qemu-devel] drive-mirror sync points

From: Richard W.M. Jones
Subject: Re: [Qemu-devel] drive-mirror sync points
Date: Mon, 13 May 2013 22:50:49 +0100
User-agent: Mutt/1.5.20 (2009-12-10)

On Mon, May 13, 2013 at 10:46:55PM +0100, Richard W.M. Jones wrote:
> On Mon, May 13, 2013 at 01:50:00PM -0400, Wolfgang Richter wrote:
> > Paolo/anyone who knows -
> > 
> > Are drive-mirror sync points (NBD flush commands) reflecting guest write
> > barriers?  Are guest write barriers respected by drive-mirror?  If so, that
> > would make drive-mirror much more palatable for disk introspection work (a
> > drop-in usable feature of QEMU!).
> I'm also interested in this question.  Further extensions to this
> (*not* drive-mirror on its own AIUI) which stefanha is working on
> should allow libguestfs to perform point-in-time snapshots of images,
> which will mean that we can do complex and long-running inspection
> operations on live guests.

OK, I got my attributions wrong there.  I see that Dietmar Maurer
wrote the original version of the patch and Stefan modified that.
Anyway I'm very interested in point-in-time snapshots.


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming blog: http://rwmj.wordpress.com
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