3PAR FC driver using excessive fc ports

[Anthony Lee]

The 3PAR FC driver uses all available FC ports on a host when an instance is attached to a volume and only one FC path is available for that host.

It would be better if the 3PAR FC driver only used a single NSP on the host when only one FC path exists. This will reduce excessive usage of FC ports on the 3PAR.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/116130

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/116130
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=e4d36161c966a1648bcabcdcc41fb7c648c1bf61
Submitter: Jenkins
Branch: master

commit e4d36161c966a1648bcabcdcc41fb7c648c1bf61
Author: Anthony Lee <email address hidden>
Date: Thu Aug 21 15:57:06 2014 -0700

    Fixing 3PAR excessive FC port usage

    Updating the 3PAR FC driver so that it can detect if there is
    only a single FC path available. When a single FC path is
    detected only a single VLUN will be created instead of one for
    every available NSP on the host. This will prevent a host
    from using extra FC ports that are not needed. If multiple
    FC paths are available all the ports will still be used.

    Closes-Bug: 1360001
    Change-Id: I4b2bdf12289dd255dd959675991fa9e2e0fcbd1e