[DRBD-user] 3-Node DRBD Without Stacking

Robinson, Eric eric.robinson at psmnv.com
Tue Nov 16 17:55:37 CET 2010


>> Is it possible to deploy a 3-node CRM-based cluster where:
>> 
>> 	-- nodes A and C share resource R1 on /dev/drbd0
>> 
>> 	-- nodes B and C share resource R2 on /dev/drbd1
>> 
>> 	-- resource constraints prevent R1 from running on node B and
prevent 
>> resource R2 from running on node A?

> I don't think I understand what you're trying to do. 
> Please elaborate.

> Why would you need to prevent R1 from "running" on 
> Host B if the resource is shared between A and C? 
> B is not at all configured to connect to R1, is it?

It's a three-node CRM cluster where node C acts as a failover for nodes
A and B, but nodes A and B do not fail over to each other. However, in a
three-node CRM cluster, all resources are allowed to run on all nodes by
default. For example, even though resource R1 only physically exists on
nodes A and C, if node A fails Pacemaker might try to start it on node B
if we don't put in some kind of constraints. You follow?  

--
Eric Robinson



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