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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 02.03.12 at 14:49, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
wrote:
> On Fri, 2 Mar 2012, Ian Campbell wrote:
>> > And if using blkback, why not (as in xend) via loop devices?
>> 
>> Support for block device script= in xl/libxl is on the 4.2 blocker list,
>> this feature would re-enable the loop+blkback case -- I think this would
>> be a better option than blktap* or qdisk once it becomes available.
> 
> Of course we need to make sure that blkback with loop devices performs
> well before doing that, and it was certainly not the case in my last tests.

No - no policy should be involved here: If file:/ is specified, one should
get blkback alone (no tap, qdisk, or what not. If another protocol was
specified, that one should be used. Only if guessing is needed, some
sort of heuristic (into which performance considerations may play) will
(naturally) be required.

Jan


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