Comment 1 for bug 2018001

It looks like there are two types of migrations available:

1. storage assisted migration

2. host assisted migration

As I understand it, during the Victoria release storage assisted migration was added to the Solidfire driver.
I believe that is what the Solidfire driver is currently trying to do. Perform a storage assisted
migration between two different storage vendor's backends (Solidfire to ONTAP). I believe what it should
be doing is performing a host assisted migration which would be successful.

cinder migrate has the "--force-host-copy" option. However cinder retype does not have an option like this.
Unless there is a way to force a host assisted migration with cinder retype, it looks like any attempt to
retype from a Solidfire volume type to a volume type used by another storage vendor's backend will fail.