From: Paolo Bonzini <pbonzini@redhat.com>
To: Wolfgang Richter <wolf@cs.cmu.edu>
Cc: "Richard W.M. Jones" <rjones@redhat.com>,
stefanha <stefanha@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [RFC] block-trace Low Level Command Supporting Disk Introspection
Date: Wed, 22 May 2013 18:11:50 +0200 [thread overview]
Message-ID: <519CEE46.5060605@redhat.com> (raw)
In-Reply-To: <CACO=3k6QwYKX6eA83zsP2RDeDwZRHD1PzpWKO8Qva6D1dRGkng@mail.gmail.com>
Il 22/05/2013 17:51, Wolfgang Richter ha scritto:
> On Thu, May 16, 2013 at 9:44 AM, Richard W.M. Jones <rjones@redhat.com
> <mailto:rjones@redhat.com>> wrote:
>
> Ideally I'd like to issue some QMP commands which would set up the
> point-in-time snapshot, and then connect to this snapshot over (eg)
> NBD, then when I'm done, send some more QMP commands to tear down the
>
> snapshot.
>
>
> This is actually interesting. Does the QEMU nbd server support multiple
> readers?
Yes.
> Essentially, if you're RWMJ (not me), and you're keeping a full
> mirror, it's clear that the mirror write stream goes to an nbd server,
> but is it possible to attach a reader to that same nbd server and read
> things back (read-only)?
Yes, it can be done with both qemu-nbd and the QEMU nbd server commands.
Paolo
next prev parent reply other threads:[~2013-05-22 16:12 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-13 21:21 [Qemu-devel] [RFC] block-trace Low Level Command Supporting Disk Introspection Wolfgang Richter
2013-05-14 8:40 ` Stefan Hajnoczi
2013-05-14 15:42 ` Wolfgang Richter
2013-05-14 8:50 ` Kevin Wolf
2013-05-14 10:04 ` Paolo Bonzini
2013-05-14 15:48 ` Wolfgang Richter
2013-05-14 16:45 ` Paolo Bonzini
2013-05-14 19:30 ` Wolfgang Richter
2013-05-15 7:59 ` Kevin Wolf
2013-05-15 8:25 ` Paolo Bonzini
2013-05-15 8:53 ` Kevin Wolf
2013-05-15 9:16 ` Paolo Bonzini
2013-05-15 9:46 ` Kevin Wolf
2013-05-15 11:54 ` Paolo Bonzini
2013-05-22 15:46 ` Wolfgang Richter
2013-05-14 15:45 ` Wolfgang Richter
2013-05-16 13:44 ` Richard W.M. Jones
2013-05-22 15:51 ` Wolfgang Richter
2013-05-22 16:11 ` Paolo Bonzini [this message]
2013-05-22 16:29 ` Wolfgang Richter
2013-05-22 16:42 ` Richard W.M. Jones
2013-05-22 18:32 ` Wolfgang Richter
2013-05-22 19:26 ` Richard W.M. Jones
2013-05-22 19:38 ` Wolfgang Richter
2013-05-22 20:47 ` Richard W.M. Jones
2013-05-22 21:46 ` Paolo Bonzini
2013-05-23 7:50 ` Stefan Hajnoczi
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