Multiple calls to lshost during attach operation

[Girish_IBM]

During attach operation there is a multiple calls to lshost, which causes delay during attach operation on Storwize SVC.

During attach or detach operation there is multiple lshost calls from "get_host_from_connector" to search for host on Storwize SVC, This lshost calls will increase based on number of hosts created on Storwize SVC.

[Sofia Enriquez (lsofia-enriquez)]

Hi Girish, do you mind to specify the backend you are using and some more detailed information about this.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/cinder/+/772623
Committed: https://opendev.org/openstack/cinder/commit/0dc4daa2140bd9d96c17269ceeef2758c678f7fd
Submitter: "Zuul (22348)"
Branch: master

commit 0dc4daa2140bd9d96c17269ceeef2758c678f7fd
Author: GirishChilukuri <email address hidden>
Date: Wed Jan 27 04:43:16 2021 +0000

    [SVF]:Fix multiple lshost calls during attach.

    [Spectrum Virtualize Family] During attach or detach operation
    there is multiple lshost calls from "get_host_from_connector",
    which is causing some delay during attach or detach operations.

    This patch fixes the issue by caching the host information during
    initialization and searching for host from the cached information.

    Closes-Bug: #1913363
    Change-Id: I73e58f8b0f4908e9fb097f7ce151a9178cf6b96f

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 19.0.0.0rc1 release candidate.