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Bug 1721104

Summary:	[RHOSP15][os-brick][Backport] FC scan always scanning all HBAs when receiving initiator_target_map'.
Product:	Red Hat OpenStack	Reporter:	Pablo Caruana <pcaruana>
Component:	python-os-brick	Assignee:	Pablo Caruana <pcaruana>
Status:	CLOSED UPSTREAM	QA Contact:	nlevinki <nlevinki>
Severity:	high	Docs Contact:
Priority:	high
Version:	15.0 (Stein)	CC:	apevec, jschluet, knoha, lhh, nlevinki, pcaruana
Target Milestone:	---	Keywords:	Triaged, ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1721099	Environment:
Last Closed:	2019-07-15 14:46:43 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1721080, 1721099

Description Pablo Caruana 2019-06-17 11:10:25 UTC

+++ This bug was initially created as a clone of Bug #1721099 +++

+++ This bug was initially created as a clone of Bug #1721080 +++

Description of problem:

FC: Ignore some HBAs from map for single WWNN

Current FC OS-Brick code only checks for single WWNN to exclude some
HBAs from scanning when we don't receive an initiator_target_map from
the backend.

There are storage arrays,like XtremIO, that due to their architecture
and design have all target ports automatically mapped to LUNs and are
returning the initiator_target_map, but some of those ports may not be
connected to our HBAs, so we end up with another case of bug #1765000.

For example,
A server contains 4 HBAs.
2 HBAs are connected to VNX only.
Other 2 HBAs are connected to XtremIO only. 


This particular patch ensures  always checking  if the target implements single WWNN, not only when not  receiving the initiator_target_map.

Main goal is decreasing  the likelihood of ending with unexpected devices as  now it will ignore unconnected HBAs (even if reported in the initiator_target_map) if  working with single WWNN target.