[ClusterLabs] Is the "allow_downscale" option supported by Corosync/Pacemaker?

[Philippe M Stedman]

Hi,

I was reading through the following votequorum manpage:
https://www.systutorials.com/docs/linux/man/5-votequorum/

and read the following about the allow_downscale feature:
-------------------------------------------------------------------------------------------

allow_downscale: 1


Enables allow downscale (AD) feature (default: 0).


THIS FEATURE IS INCOMPLETE AND CURRENTLY UNSUPPORTED.


The general behaviour of votequorum is to never decrease expected votes or
quorum.


When AD is enabled, both expected votes and quorum are recalculated when a
node leaves the cluster in a clean state (normal corosync shutdown process)
down to configured expected_votes.
-------------------------------------------------------------------------------------------


I am interested in using this option for my cluster to allow hosts to be
gracefully shutdown for maintenance operations for prolonged amounts of
time without adversely affecting quorum for the remaining active hosts in
the cluster. Does anybody know when this feature will be supported?


Thanks,

Phil Stedman
Db2 High Availability Development and Support
Email: pmstedma at us.ibm.com
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