Comment 18 for bug 1867163

Reviewed: https://review.opendev.org/747133
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=07991b7e8f4f3a46ec76cd10ac41e502b03560a8
Submitter: Zuul
Branch: stable/ussuri

commit 07991b7e8f4f3a46ec76cd10ac41e502b03560a8
Author: Helen Walsh <email address hidden>
Date: Fri Jun 12 15:29:00 2020 +0100

    PowerMax Driver - Legacy volumes fail to live migrate

    The fix moves the legacy shared volume from the masking view
    structure in Ocata and sooner (when SMI-S was supported) to staging
    masking view(s) in Pike and later releases (U4P REST).
    In Ocata, the live migration process shared the storage group,
    containing the volume, among the different compute Nodes. In PIke,
    we changed the masking view structure to facilitate a cleaner live
    migration process where only the volume is migrated and not all the
    other volumes in the storage group. The staging storage group and
    masking views facilitate a seamless live migration operation in
    upgraded releases.

    Change-Id: I4d28d8ed2375f68eed511de5c25898362eac1def
    Closes-Bug: #1867163
    (cherry picked from commit 197e024747ca04daeb35a9eaa9f1350089211ea3)