Fuel doesn't use ceph COW feature even configure nova and glance to use rbd

[Yaguang Tang]

Tested with MOS8.0 and MOS 9.0

1. configuration is Nova,Glance and Cinder to use Ceph RBD storage.

2. Nova doesn't use Ceph copy on write feature to clone images instead it download image from ceph
to local /var/lib/nova/instances/_base ,then upload image to ceph pool. as a result, the instance
image cache directory could be full filled if user has a lot of images. also instance booting time
is too long.

3.The reason seems to be that glance API doesn't enable show_multiple_locations functionality.

[Yaguang Tang (heut2008)]

Workaround for existing env is to config all controller nodes /etc/glance/glance-api.conf

set show_multiple_locations=True and restart glance-api service.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/397619

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/397619
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=220566bf6d2ad740bc55e35b7e559d60e17ef5f2
Submitter: Jenkins
Branch: master

commit 220566bf6d2ad740bc55e35b7e559d60e17ef5f2
Author: Yaguang Tang <email address hidden>
Date: Tue Nov 15 17:28:07 2016 +0800

    Enable show_multiple_loations option for glance when using Ceph

    When using Ceph as storage backend, to take the benefit of Ceph
    inside snapshot, show_multiple_locations option needs to be enabled
    so image snapshot can be done using ceph clone.

    Change-Id: I8ecfcbd7b0df518f5dcf046693203bd7815efbb2
    Closes-Bug: #1641572

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/newton
Review: https://review.openstack.org/406055

[Alexey Stupnikov (astupnikov)]

Closing this bug as Won't fix for 8.0-updates and 9.0 because:
  - we will get mixed deployed environments after providing this fix in MU;
  - this bug has Medium importance and non-customer-found.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/411740

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/406055
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=162c09a08d57a739fed99ca1db533eae523328b5
Submitter: Jenkins
Branch: stable/newton

commit 162c09a08d57a739fed99ca1db533eae523328b5
Author: Yaguang Tang <email address hidden>
Date: Tue Nov 15 17:28:07 2016 +0800

    Enable show_multiple_loations option for glance when using Ceph

    When using Ceph as storage backend, to take the benefit of Ceph
    inside snapshot, show_multiple_locations option needs to be enabled
    so image snapshot can be done using ceph clone.

    Change-Id: I8ecfcbd7b0df518f5dcf046693203bd7815efbb2
    Closes-Bug: #1641572
    (cherry picked from commit 220566bf6d2ad740bc55e35b7e559d60e17ef5f2)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/411740
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=843b817f6a8c5977bdce49a95ad28349210e0a72
Submitter: Jenkins
Branch: stable/mitaka

commit 843b817f6a8c5977bdce49a95ad28349210e0a72
Author: Yaguang Tang <email address hidden>
Date: Tue Nov 15 17:28:07 2016 +0800

    Enable show_multiple_loations option for glance when using Ceph

    When using Ceph as storage backend, to take the benefit of Ceph
    inside snapshot, show_multiple_locations option needs to be enabled
    so image snapshot can be done using ceph clone.

    Change-Id: I8ecfcbd7b0df518f5dcf046693203bd7815efbb2
    Closes-Bug: #1641572
    (cherry picked from commit 220566bf6d2ad740bc55e35b7e559d60e17ef5f2)

[TatyanaGladysheva (tgladysheva)]

Verified on 9.2 snapshot #660.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/fuel-library 11.0.0.0rc1 release candidate.