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Re: [Qemu-devel] drive-mirror sync points
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From: |
Wolfgang Richter |
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Subject: |
Re: [Qemu-devel] drive-mirror sync points |
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Date: |
Mon, 13 May 2013 18:09:09 -0400 |
On May 13, 2013, at 5:46 PM, "Richard W.M. Jones" <address@hidden> 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.
And I'm trying to do complex, long-running inspection on live guests without
needing point-in-time snapshots :-)