[Pacemaker] Drbd on a asymmetric cluster

[Andrew Beekhof]

On Fri, Mar 11, 2011 at 12:30 PM, Arthur B. Olsen <ABO at ft.fo> wrote:
> My config is:
> node sql01 attributes standby="off"
> node sql02 attributes standby="off"
> primitive drbd_mysql ocf:linbit:drbd params drbd_resource="r0" op monitor
> interval="15s"
> primitive fs_mysql ocf:heartbeat:Filesystem params device="/dev/drbd0"
> directory="/datastore01" fstype="ext4"
> primitive ip_mysql ocf:heartbeat:IPaddr2 params ip="192.168.50.20"
> primitive mysqld lsb:mysql
> group mysql fs_mysql ip_mysql mysqld
> ms ms_drbd_mysql drbd_mysql meta master-max="1" master-node-max="1"
> clone-max="2" clone-node-max="1" notify="true"
> location ms_drbd_mysql_on_both ms_drbd_mysql rule
> $id="ms_drbd_mysql_on_both-rule" inf: #uname eq sql01 or #uname eq sql02
> location mysql_pri_loc mysql inf: sql01
> location mysql_alt_loc mysql 100: sql02
> colocation mysql_on_drbd inf: mysql ms_drbd_mysql:Master
> order mysql_after_drbd inf: ms_drbd_mysql:promote mysql:start
> property $id="cib-bootstrap-options"
> dc-version="1.0.9-74392a28b7f31d7ddc86689598bd23114f58978b"
> cluster-infrastructure="openais" expected-quorum-votes="2"
> stonith-enabled="false" symmetric-cluster="false" no-quorum-policy="ignore"
> I hope someone can explain this to me. It starts everything up in sql01 as
> primary and sql02 as secondary. When i put sql01 in standby it moves to
> sql02.
> But when i put sql01 online, the resources stay put on sql02. My stickiness
> is zero.

In 1.0.x clones (and therefore master/slave resources) are "a bit"
sticky by default to help prevent them being shuffled around the
cluster for no reason.

This limitation has been removed in 1.1.5.

> I have tried to replace the ms_drbd_mysql_on_both with:
> location ms_drbd_mysql_pri_loc ms_drbd_mysql inf: sql01
> location ms_drbd_mysql_sec_loc ms_drbd_mysql 100: sql02
> Then it freaks out, switching rapidly between
>
> Node sql01: online
> drbd_mysql:0 (ocf::linbit:drbd) Slave
> Node sql02: online
> drbd_mysql:1 (ocf::linbit:drbd) Slave
> And
> Node sql01: online
> Node sql02: online
> drbd_mysql:1 (ocf::linbit:drbd) Slave
>
> I can't find any examples on how to do drbd on an asymmetric cluster
> Thanks
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>
>