[Linux-HA] Redundant Rings "Still Not There?"

Serge Dubrouski sergeyfd at gmail.com
Fri Oct 22 12:37:42 MDT 2010

On Thu, Oct 21, 2010 at 9:22 AM, Robinson, Eric <eric.robinson at psmnv.com> wrote:
>> 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?

I'm probably missing something, but as far as I know DRBD doesn't use
Corosync/OpenAIS. So Ring 2 and Ring 3 in your terminology are just
network links for DRBD data replication, right?
> --
> Eric Robinson
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Serge Dubrouski.

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