> The way resources move around has nothing to do with how you 
> setup corosync rings. For each ring, all nodes must be accessible
> over the interface specified in the interface section. 
> How else can one form a ring? ;-) 

I think the confusion is entering the picture because (1) I'm using
back-to-back Ethernet connections for DRBD replication. Those are
point-to-point links from NODE1 to NODE3 and NODE2 to NODE3, but there
is no link necessary between NODE1 and NODE2 because there is no DRBD
replication between them. But (2) I am also using those links for
corosync communication because they are more reliable than using the
bonded interfaces through the switched network (although I am using
those too).  

So I guess what I'm trying to accomplish is to have three separate
corosync rings:

-- Ring 1 through the switched network that includes all three nodes,
where pacemaker is configured with resource constraints to keep R1 and
R2 on their assigned node pairs.

-- Ring 2 that includes NODE1 and NODE3 (logically a two-node "ring,"
though technically just back-to-back)

-- Ring 3 that includes NODE2 and NODE3 (logically a two-node "ring,"
though technically just back-to-back)

Does that make sense?

--
Eric Robinson


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