Unity: hosts still exist on Unity even after all LUNs are detached

[Ryan Liang]

The host still exists on Unity even after all LUNs are detached from it.

Unity driver creates the host and attaches the luns to the host. In current implementation, the terminate_connection only detaches the luns from the host, and leaves the host as it is.

The requirement is from the user who is using IBM PowerVC. In their use case, there would be one host per VM Instance on Unity system. After deleting those VM instances from OpenStack, there still were lots of hosts left on Unity.

The solution is adding an option to cinder.conf, which could let Unity driver remove the hosts from Unity system after the last LUN is detached.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/565945
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=f9a9aa5a25688cac86e5dc060a20374e4a29bbef
Submitter: Zuul
Branch: master

commit f9a9aa5a25688cac86e5dc060a20374e4a29bbef
Author: Ryan Liang <email address hidden>
Date: Wed May 2 10:30:20 2018 +0800

    [Unity] Add support of removing empty host

    Add an option in Unity Cinder driver to customize the removing
    of empty host. The option is named `remove_empty_host`. Its
    default value is False. When it is set to True, the host will
    be removed from Unity after the last LUN is detached from it.

    Change-Id: I2d9fad2c977a61f5b26a6449a8e509911eff28e0
    Closes-bug: #1768711

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/queens
Review: https://review.openstack.org/570520

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/570520
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=24bd0c4b645dbcb99977e6a3e16c51979455b1eb
Submitter: Zuul
Branch: stable/queens

commit 24bd0c4b645dbcb99977e6a3e16c51979455b1eb
Author: Ryan Liang <email address hidden>
Date: Wed May 2 10:30:20 2018 +0800

    [Unity] Add support of removing empty host

    Add an option in Unity Cinder driver to customize the removing
    of empty host. The option is named `remove_empty_host`. Its
    default value is False. When it is set to True, the host will
    be removed from Unity after the last LUN is detached from it.

    Change-Id: I2d9fad2c977a61f5b26a6449a8e509911eff28e0
    Closes-bug: #1768711
    (cherry picked from commit f9a9aa5a25688cac86e5dc060a20374e4a29bbef)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 13.0.0.0b2 development milestone.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/pike
Review: https://review.openstack.org/574120

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/574120
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=66c50600def5f8f25106afaa316e7fc300d72c87
Submitter: Zuul
Branch: stable/pike

commit 66c50600def5f8f25106afaa316e7fc300d72c87
Author: Ryan Liang <email address hidden>
Date: Wed May 2 10:30:20 2018 +0800

    [Unity] Add support of removing empty host

    Add an option in Unity Cinder driver to customize the removing
    of empty host. The option is named `remove_empty_host`. Its
    default value is False. When it is set to True, the host will
    be removed from Unity after the last LUN is detached from it.

    Change-Id: I2d9fad2c977a61f5b26a6449a8e509911eff28e0
    Closes-bug: #1768711
    (cherry picked from commit f9a9aa5a25688cac86e5dc060a20374e4a29bbef)
    (cherry picked from commit 24bd0c4b645dbcb99977e6a3e16c51979455b1eb)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 12.0.3 release.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/ocata
Review: https://review.openstack.org/626069

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 11.2.0 release.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/626069
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=9773f963fea7e8a7033a047fda8967259ef4f99f
Submitter: Zuul
Branch: stable/ocata

commit 9773f963fea7e8a7033a047fda8967259ef4f99f
Author: Ryan Liang <email address hidden>
Date: Wed May 2 10:30:20 2018 +0800

    [Unity] Add support of removing empty host

    Add an option in Unity Cinder driver to customize the removing
    of empty host. The option is named `remove_empty_host`. Its
    default value is False. When it is set to True, the host will
    be removed from Unity after the last LUN is detached from it.

    Change-Id: I2d9fad2c977a61f5b26a6449a8e509911eff28e0
    Closes-bug: #1768711
    (cherry picked from commit f9a9aa5a25688cac86e5dc060a20374e4a29bbef)
    (cherry picked from commit 24bd0c4b645dbcb99977e6a3e16c51979455b1eb)
    (cherry picked from commit 66c50600def5f8f25106afaa316e7fc300d72c87)