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

From: Wolfgang Richter
Subject: Re: [Qemu-devel] [RFC] block-trace Low Level Command Supporting Disk Introspection
Date: Wed, 22 May 2013 12:29:30 -0400

On Wed, May 22, 2013 at 12:11 PM, Paolo Bonzini <address@hidden> wrote:
> 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.

Then this means, if there was an active mirror (or snapshot being created), it would
be easy to attach an nbd client as a reader to it even as it is being synchronized
(perhaps dangerous?). 


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