Re: [Xen-devel] Qcow2 support

[Philipp Hahn <hahn@xxxxxxxxxxxxx>]

Hello,

On Monday November 08 2010 10:54:11 Pasi Kärkkäinen wrote:
> On Mon, Nov 08, 2010 at 10:31:03AM +0100, Philipp Hahn wrote:

thank you for your fast answer,

> > > http://wiki.xensource.com/xenwiki/blktap2
> >
> > Any news on Qcow2 support for Xen4?
> > Is someone working on it?
>
> Did you actually read the blktap2 wiki page?

Yes, I tried to parse it but maybe I misunderstood something:
For xen-4.0.0 it's taking about "tap:qcow2:/path",
For xen-4.0.1 it's suddenly taking about "tap2:tapdisk:XXX:/path"

Also from reading xen-4.0.1/tools/blktap2/drivers/block-qcow.c:927
>         case 2:
>           //TODO: Port qcow2 to new blktap framework.
>           //            close(fd);
>           //            dd->drv = &tapdisk_qcow2;
>           //            return dd->drv->td_open(dd, name, flags);
>           goto fail;

So maybe I'm just confused about blktap[12] and the sudden naming change with 
tap/tap2.

> It should work with Xen 4.0.

Maybe I asked my question wrong: Is qcow2 working with xen4-aio or what is 
currently best practice using qcow2?
To give some context: Mainly I'm interesed in finding a suitable image format, 
which supports base-images for copy-on-write (and probably snap-shots).

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

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