Re: [Xen-devel] xl block-attach vs block-detach

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.03.12 at 17:45, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Thu, 2012-03-01 at 16:33 +0000, Jan Beulich wrote:
>> Further, why is it that with no blktap module loaded I'm getting an
>> incomplete attach when using the (deprecated) file:/ format for
>> specifying the backing file? It reports that it would be using qdisk,
>> and blkfront also sees the device appearing, but all I'm seeing in the
>> kernel log is the single message from blkfront's probe function.
>> (With no blktap in pv-ops, I wonder how file backed disks work there.)
> 
> file backed disks without blktap use the qdisk backend supplied by qemu.

What is the rationale for using blkback over blktap for file backed
disks anyway? If using blktap, why not directly do so? And if using
blkback, why not (as in xend) via loop devices?

Jan


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