Bug 1299652 – Make alua prioritizer able to exclusively use the preferred path, if available

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Bug 1299652 - Make alua prioritizer able to exclusively use the preferred path, if available

Summary:	Make alua prioritizer able to exclusively use the preferred path, if available

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	device-mapper-multipath (Show other bugs)
Sub Component:
Version:	7.1
Hardware:	Unspecified Unspecified

Priority	unspecified Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Ben Marzinski
QA Contact:	Zhang Yi
Docs Contact:	Milan Navratil

URL:
Whiteboard:
Keywords:

Depends On:	1289353 1305997
Blocks:	1313485 1295577 1364188
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Reported:	2016-01-18 17:01 EST by Ben Marzinski
Modified:	2016-11-04 04:17 EDT (History)
CC List:	14 users (show)

See Also:
Fixed In Version:	device-mapper-multipath-0.4.9-87.el7
Doc Type:	Release Note
Doc Text:	The "exclusive_pref_bit" optional argument has been added to the multipath ALUA prioritizer If the "exclusive_pref_bit" argument is added to the multipath Asymmetric Logical Unit Access (ALUA) prioritizer, and a path has the Target Port Group Support (TPGS) `pref` bit set, multipath makes a path group using only that path and assigns the highest priority to the path. Users can now either allow the preferred path to be in a path group with other paths that are equally optimized, which is the default option, or in a path group by itself by adding the "exclusive_pref_bit" argument.
Story Points:	---
Clone Of:	1289353
Clones:	1364188 (view as bug list)
Environment:
Last Closed:	2016-11-04 04:17:04 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2016:2536	normal	SHIPPED_LIVE	device-mapper-multipath bug fix and enhancement update	2016-11-03 10:18:10 EDT

Groups: None (edit)

Comment 1 Ben Marzinski 2016-02-26 17:56:11 EST

The multipath alua prioritizer now allows a an option, "exclusive_pref_bit"

If you use

    prio "alua exclusive_pref_bit"

in your device configuration, multipath will create a pathgroup that only contains the path with the pref bit set, and will give that pathgroup the highest priority.

Comment 2 Ben Marzinski 2016-03-17 17:23:14 EDT

Oops. Comment 1 used the RHEL6 syntax.  In RHEL7, you would add

prio_args "exclusive_pref_bit"

to your device configuration. This is only used if you have

prio "alua"

set as well.

Comment 12 errata-xmlrpc 2016-11-04 04:17:04 EDT

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2536.html

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