As I understand it, if the volume you are trying to migrate has a volume type 
then it can only be migrated to other hosts that support that type.

If you want to change the type of a volume you will need to use cinder retype.


________________________________
> From: [email protected] 
> To: [email protected] 
> Date: Wed, 4 Jun 2014 11:23:06 -0400 
> Subject: [Openstack] migrate volume 
> 
> 
> Hi All, 
> 
> I would really appreciate some guidance on migrate 
> volume(storage-assisted volume migration). I have a multi backend 
> environment where each volume type has a volume_backend_name extra 
> spec. When I do a migrate to move my volume from one backend(host) to 
> another it fails saying there are no hosts available. On tracing the 
> issue I see the volume_backend_name is the problem. The value of 
> volume_backend_name will always be different from source to target, but 
> openstack blocks the operation from proceeding because of this 
> difference. 
> 
> 
> 
> From the logs… 
> 
> 2014-06-04 07:35:03.696 30454 INFO 
> cinder.openstack.common.scheduler.filters.capabilities_filter 
> [req-bebd425b-36bc-43df-9372-b38b803869ec None] extra_spec requirement 
> 'VMAX_FC_SILVER' does not match 'VMAX_FC_GOLD' 
> 
> 
> 
> Thank you in advance 
> 
> Helen 
> 
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