Live-migration with ZFSSA-backed cinder volume - filesystems to go read-only

[abhiram moturi]

On live-migrating a nova instance booted from a cinder volume provided by a ZFSSA, the migration succeeds, but the instance is left with its root filesystem mounted read-only.

cause -
the cause is in the initialize_connection(). Currently initialize_connection set the initiator groups for the LUN to only group. terminate_connection() set it to mask all groups.

fix -
initialize_connection() makes a new list of initiator groups by appending the new group with the ones already attached to the LUN. terminate_connection() makes a list by removing the one it should be detached from.

[Sean McGinnis (sean-mcginnis)]

Unassigning due to no activity.

[Kedar (kedar-vidvans)]

Change undergoing review at: https://review.openstack.org/#/c/371199/

[Sean McGinnis (sean-mcginnis)]

Unassigning due to no activity for > 6 months.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/371199
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=278ad6a2bd8a8401ce40d57a8a243500d11b1c17
Submitter: Jenkins
Branch: master

commit 278ad6a2bd8a8401ce40d57a8a243500d11b1c17
Author: iain MacDonnell <email address hidden>
Date: Fri Jul 14 01:33:19 2017 +0000

    ZFSSA iSCSI volume driver multi-connect

    Fix ZFSSA iSCSI volume driver to allow connection of a volume to more
    than one connector (initiator group) at the same time, which is
    required for live-migration to work.

    Note: ZFSSA software release 2013.1.3.x (or higher) will be required
    to use this functionality.

    Change-Id: I44b86fd967a21da465b44a8db15331ca17438961
    Closes-Bug: #1565051

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 11.0.0.0b3 development milestone.