Comment 3 for bug 1940069

Reviewed: https://review.opendev.org/c/openstack/cinder/+/804698
Committed: https://opendev.org/openstack/cinder/commit/1daded795109b9cc8e3954befe513400fe1ef036
Submitter: "Zuul (22348)"
Branch: master

commit 1daded795109b9cc8e3954befe513400fe1ef036
Author: stack <email address hidden>
Date: Mon Aug 16 11:10:55 2021 +0000

    HPE 3PAR: Reuse existing session

    The 3PAR driver creates new SSH connection to the backend for each
    operation (eg. create/delete volume).

    There is a limit on maximum number of SSH connections from 3PAR
    backend i.e 24 connections.

    The problem is that when multiple concurrent operations are
    performed, this limit gets reached & further operations get
    errored out.

    This patch performs two things:
    [a] Instead of creating new session for each operation, an attempt is
    made to reuse existing session for as most operations.
    [b] Since WSAPI of 3PAR has evolved, wsapi (http/https) requests are
    used; thus SSH connections are no longer required.

    Closes-Bug: #1940069
    Change-Id: Ica59db93a0153be9ab2e5e9165651173d9b2afd0