[Linux-HA] Constraint: Two drdb master on the same node?

[Dominik Klein]

> I have the following problem with a two-node cluster:
> 
> I have two DRBD resources. On the node where drbd0 is master, a certain 
> resource group with different resources will be activated. On the node 
> where drbd1 is master, this will happen with another resource group.

You can get the necessary constraints from the DRBD Howto:
http://wiki.linux-ha.org/DRBD/HowTov2

> Now I want that the two DRBD resources are always master on the same 
> node? How do I create such a constraint the cib/crm file?

<rsc_colocation id="master_on_master" to="ms-drbd3" to_role="master" 
from="ms-drbd1" from_role="master"  score="infinity"/>

Regards
Dominik