[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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 22:46:55 +0100 |
|
User-agent: |
Mutt/1.5.20 (2009-12-10) |
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.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top