Re: [Qemu-devel] [PATCH 00/13] QED image streaming

[Philipp Hahn <hahn@univention.de>]

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Hello,

hopefully just a quick question...

On Tuesday 14 June 2011 20:18:18 Stefan Hajnoczi wrote:
> This patch series adds image streaming support for QED image files.  Other
> image formats can also be supported in the future.
>
> Image streaming populates the file in the background while the guest is
> running.  This makes it possible to start the guest before its image file
> has been fully provisioned.
...
> When image streaming is enabled, the unallocated regions of the image file
> are populated with the data from the backing file.  This occurs in the
> background and the guest can perform regular I/O in the meantime.  Once the
> entire backing file has been streamed, the image no longer requires a
> backing file and will drop its reference.

Does this also work for intermediate images, that is
- master image on a NFS share,
- local copy on a local drive using CoR-streaming from master,
- local instance based on local copy using CoW.

We normally have mostly independent servers without a shared storage, expect a 
global NFS share for the master images. Currently we have to copy the master 
image to the local server first, before we than can create lots of instances 
from then, which have few changed relative to the master, so we don't want 
the copying to happen there.

If haven't looked at QED yet, so thanks in advance for your answer.

Sincerely
Philipp Hahn
-- 
Philipp Hahn           Open Source Software Engineer      hahn@univention.de
Univention GmbH        Linux for Your Business        fon: +49 421 22 232- 0
Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99
                                                   http://www.univention.de/

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