[ClusterLabs] Help needed getting DRBD cluster working

[Lars Ellenberg]

On Tue, Oct 06, 2015 at 10:13:00AM -0500, Ken Gaillot wrote:
> > ms ms_drbd0 drbd_disc0 \
> > 	meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true" target-role="Started"
> 
> You want to omit target-role, or set it to "Master". Otherwise both
> nodes will start as slaves.

That is incorrect.  "Started" != "Slave"

target-role "Started" actually means "default for the resource being
handled" (the same as if you just removed that target-role attribute),
which in this case means "start up to clone-max instances,
then of those promote up to master-max instances"

target-role Slave would in fact prohibit promotion.

and target-role Master would, back in the day, trigger a pacemaker bug
where it would try to fulfill target-role, and happend to ignore
master-max, trying to promote all instances everywhere ;-)

not set: default behaviour
started: same as not set
slave:   do not promote
master:  nowadays for ms resources same as "Started" or not set,
         but used to trigger some nasty "promote everywhere" bug
	 (a few years back)

-- 
: Lars Ellenberg
: http://www.LINBIT.com | Your Way to High Availability
: DRBD, Linux-HA  and  Pacemaker support and consulting

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