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Just wanted to mention in this context that those of us with GPFS
backing stores need RAW to allow copy-on-write image and volume
creation.

On Mon, Oct 26, 2015 at 2:23 AM, Tim Bell <Tim.Bell at cern.ch> wrote:
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> On 25/10/15 23:57, "Daniel P. Berrange" <berrange at redhat.com> wrote:
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>>On Sat, Oct 24, 2015 at 07:42:53AM +0000, Tim Bell wrote:
>>> Always having ephemeral disks as raw might make sense given that there
>>> is going to be little overlap with others (and therefore the qcow2
>>> benefits are not significant)
>>
>>The current big benefit for qcow2 is really the abilityo have a
>>backing file, but Nova only uses that for the root disk, so having
>>it for ephemeral disks isn't important and so they could easily be
>>raw.
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> +1… agreed
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>>Regards,
>>Daniel
>>--
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