[Rdo-list] cinder retype and QoS

[Kashyap Chamarthy]

On Wed, Nov 19, 2014 at 10:42:42AM +0000, Arne Wiebalck wrote:
> 
> 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 :) 

Hmm, let's see if any Packstack/Cinder developers will weigh in here.

> 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.

I cannot speak for the author of that post, but probably it's talking
about what's in the upstream. :-)

-- 
/kashyap