Support was added for volume retype and migration operations to the Block Storage service's HPE Nimble Storage driver.
Pull the following bug in Redhat osp 13 https://bugs.launchpad.net/cinder/+bug/1790907
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.