powerstore driver: no volume caching after 35 volumes

[Vladislav Belogrudov]

To speed up creation of new instances from an image customers can use "image volume cache" feature [1]. Unfortunately this feature does not work well for instances after 35th. Instead of service account volume clone/snap Cinder starts pulling image from Glance and makes a lot of copying for all following instances.

The driver needs to throw exception "SnapshotLimitReached" to invalidate cache and start over with new volume snapshots. This bug is very similar to [2]

[1] https://docs.openstack.org/cinder/latest/admin/blockstorage-image-volume-cache.html
[2] https://bugs.launchpad.net/cinder/+bug/1942095

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/cinder/+/867753
Committed: https://opendev.org/openstack/cinder/commit/f47be72adc41e731502463e0f43102f84ef9903d
Submitter: "Zuul (22348)"
Branch: master

commit f47be72adc41e731502463e0f43102f84ef9903d
Author: tony-saad <email address hidden>
Date: Wed Dec 14 17:53:09 2022 -0800

    Dell PowerStore: Volume caching exception support

    Fixed volume caching in PowerStore driver. Volume caching stops working
    after 32nd volume created from the same image due to snapshot limit per
    volume in PowerStore. The driver needs to throw exception
    SnapshotLimitReached to invalidate cache and start over with new volume
    snapshots.

    Closes-Bug: #1962824
    Change-Id: I8b46d443a75bf98260394552f77c6807e405dce7

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/zed
Review: https://review.opendev.org/c/openstack/cinder/+/876226

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 22.0.0.0rc1 release candidate.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/cinder/+/876226
Committed: https://opendev.org/openstack/cinder/commit/04f06347037578ab8d2b5d1eb759754b039769dc
Submitter: "Zuul (22348)"
Branch: stable/zed

commit 04f06347037578ab8d2b5d1eb759754b039769dc
Author: tony-saad <email address hidden>
Date: Wed Dec 14 17:53:09 2022 -0800

    Dell PowerStore: Volume caching exception support

    Fixed volume caching in PowerStore driver. Volume caching stops working
    after 32nd volume created from the same image due to snapshot limit per
    volume in PowerStore. The driver needs to throw exception
    SnapshotLimitReached to invalidate cache and start over with new volume
    snapshots.

    Closes-Bug: #1962824
    Change-Id: I8b46d443a75bf98260394552f77c6807e405dce7
    (cherry picked from commit f47be72adc41e731502463e0f43102f84ef9903d)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 21.2.0 release.