linux-kernel - Re: [Xen-devel] Re: [PATCH v3] xen block backend.

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Date:	Thu, 21 Apr 2011 09:38:31 +0100
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"jaxboe@...ionio.com" <jaxboe@...ionio.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"konrad@...nel.org" <konrad@...nel.org>
Subject: Re: [Xen-devel] Re: [PATCH v3] xen block backend.

On Thu, 2011-04-21 at 09:06 +0100, Christoph Hellwig wrote:
> On Thu, Apr 21, 2011 at 09:03:23AM +0100, Ian Campbell wrote:
> > BTW about the only nice property blktap has as it currently stands over
> > this plan is that it exports an actual block device from vhd, qcow etc
> > files (in some sense blktap is a loopback driver for complex disk image
> > file formats). It turns out to occasionally be quite useful to be able
> > to mount such files, even on non-virtualisation systems (in its current
> > incarnation blktap has no dependency on Xen).
> 
> You can already do that using qemu-nbd today.

Good to know, I'd had a vague feeling this was possible but hadn't
looked into how.

> In most cases the image format support in qemu is much better than in the various Xen trees
> anyway, with vhd beeing the only one that looks potentially better in Xen.

That's about what I reckon too.

Ian.

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