I use the virtio-scsi driver.

On Aug 22, 2013, at 12:05 PM, David Blundell <[email protected]> 
wrote:

>> I see yet another caveat: According to that documentation, it only works with
>> the IDE driver, not with virtio.
>> 
>>    Guido
> 
> I've just been looking into this but have not yet tested.  It looks like 
> discard is supported in the newer virtio-scsi devices but not virtio-blk.
> 
> This Sheepdog page has a little more information on qemu discard 
> https://github.com/sheepdog/sheepdog/wiki/Discard-Support
> 
> David
> 
> 
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