[Rdo-list] cinder retype and QoS

[Arne Wiebalck]

On 19 Nov 2014, at 11:33, Kashyap Chamarthy <kchamart at redhat.com> wrote:

> On Wed, Nov 19, 2014 at 09:59:46AM +0000, Arne Wiebalck wrote:
>> Hi,
>> 
>>> From what I see, "cinder retype” does not work with different QoS
>>> types yet, correct?
> 
> I'm not a Cinder expert, but looking at the change[1] that introduced
> the Cinder volume retype functionality, at end of the commit message, it
> says:
> 
>  [. . .]
>  This version will cause retype operations to fail if the current and
>  new volume types have different:
>  1. QoS settings that are enforced by the front-end for in-use volumes.
>  2. encryption settings.
> 
> Not sure if that (point 1 there) answers your question.
> 
> 
> [1] https://review.openstack.org/#/c/44881/ -- Add ability to modify
> volume type

Thanks. I saw that change. This and packstack tells me it does not work, at least
for a Ceph based backend :) Also the Cinder code (retype being empty in driver.py
and not being overwritten rbd.py points) in that direction.

http://redhatstackblog.redhat.com/2014/04/15/whats-new-in-icehouse-storage/
gives a slightly different impression IMHO.

Cheers,
 Arne


--
Arne Wiebalck
CERN IT