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Re: [Qemu-devel] [RFC] block-trace Low Level Command Supporting Disk Int

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC] block-trace Low Level Command Supporting Disk Introspection
Date: Wed, 22 May 2013 18:11:50 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 22/05/2013 17:51, Wolfgang Richter ha scritto:
> On Thu, May 16, 2013 at 9:44 AM, Richard W.M. Jones <address@hidden
> <mailto:address@hidden>> 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?


> 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.


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