[Openstack] what code in cinder volume driver supports volume migration between two backends of same type but having different volume types? [cinder]

Nikesh Kumar Mahalka nikeshmahalka at vedams.com
Sat Feb 28 10:02:50 UTC 2015

I tried below link  for volume migration on my driver and also similar
efforts for LVM.
Even whatever documents available in openstack for
volume-migration,each one showing volume migration of a volume having
volume type None

I added host assisted volume migration function in my cinder driver.
When i am trying volume migration on a volume without volume type,then
my volume migration function is getting called and i  am able to do
volume migration.

But when i am trying volume migration on a volume having volume
type,then my volume migration function is not getting called.


On Tue, Jan 20, 2015 at 12:31 AM, Nikesh Kumar Mahalka
<nikeshmahalka at vedams.com> wrote:
> do cinder retype (v2) works for lvm?
> How to use cinder retype?
> I tried for volume migration from one volume-type LVM backend to
> another volume-type LVM backend.But its failed.
> How can i acheive this?
> Similarly i am writing a cinder volume driver for my array and want to
> migrate volume from one volume type to another volume type for my
> array backends.
> so want to know how can i achieve this in cinder driver?
> Regards
> Nikesh

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