Bug 1299652 - Make alua prioritizer able to exclusively use the preferred path, if available
Make alua prioritizer able to exclusively use the preferred path, if available
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: device-mapper-multipath (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Ben Marzinski
Zhang Yi
Milan Navratil
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)
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
: 1364188 (view as bug list)
Last Closed: 2016-11-04 04:17:04 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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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.


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