[Bug 1959712] Re: [SRU] Add iSCSI support to HPE 3PAR driver for Primera 4.2 and higher

[Nobuto Murata]

Hi Raghavendra,

First of all, thank you for your effort tying to make things forward.
I'm afraid devstack works in this specific case because devstack pulls
Cinder from git repository directly instead of using Ubuntu's binary
packages (.deb basically) if I'm not mistaken. This validation requires
using deb packages proposed in specific repository pockets.

I'm aware that a team working with us is trying to validate the proposed
packages this week (or by early next week) so I think we can wait for
them to provide the feedback.

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https://bugs.launchpad.net/bugs/1959712

Title:
  [SRU] Add iSCSI support to HPE 3PAR driver for Primera 4.2 and higher

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in Ubuntu Cloud Archive victoria series:
  Fix Committed
Status in cinder package in Ubuntu:
  Invalid
Status in cinder source package in Focal:
  Fix Committed

Bug description:
  [Description]
  OpenStack cinder in Focal (OpenStack Ussuri) is lacking iSCSI support for HPE Primera 4.2 and higher. This is now supported in Cinder and we would like to enable it in Ubuntu Focal as well as OpenStack Ussuri.

  The rationale for this SRU falls under harware enablement for Long
  Term Support releases.

  [Test Case]
  1. Deploy OpenStack with:
   - HPE 3PAR *iSCSI* driver enabled for Cinder
   - with Primera >= 4.2
    as per: https://docs.openstack.org/cinder/latest/configuration/block-storage/drivers/hpe-3par-driver.html
  2. Create a volume
    openstack volume create (--type hpe-primera) --size 10 sru-test-before

  3. Confirm the volume is successfully created while it gave an error
  as "For Primera, only FC is supported. iSCSI cannot be used"
  previously.

  [Regression Potential]
  This is a pretty simple patch. Where the code used to always raise a not implemented error for Primera, it now raises the not implemented error only for < Primera 4.2. Where things could go wrong? It's possible the version checking could have an issue but that code seems standard and the upstream patch has been merged back to stable/victoria [1]. Regression testing will cover that code path as well.
  [1] https://review.opendev.org/c/openstack/cinder/+/820611

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