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

Robinson, Eric eric.robinson at psmnv.com
Sat Oct 23 12:23:46 MDT 2010

> Looks like you are mixing up physical connections 
> and Corosync rings. 

I should not have mentioned DRBD at all as it confuses the question. 

Let me try it this way:

How do I build a three-node Corosync cluster with redundant heartbeat
paths? I don't trust the switched network or the Ethernet bonding
drivers to be 100% reliable, and it is just good practice to have
multiple heartbeat paths. On my old 2-node clusters, I have three
heartbeat paths: the switched network, back-to-back links, and serial

It sounds like you are saying that to have multiple heartbeat paths on a
3-node Corosync cluster, each heartbeat path must be through a separate
switched network or VLAN. I can see why this would be the case.

I was hoping that a crossover cable could be used to form a "logical"
ring between two nodes, and that I could configure two logical rings
between 3 servers. 

So really, maybe I'm not trying to build a 3-node cluster. What I'm
really trying to build are two 2-node clusters where one of the physical
servers participates in BOTH 2-node clusters. CLUSTER1 would consist of
physical servers A and C. CLUSTER2 would consist of physical servers B
and C.

So maybe what I want to know is, is it possible to run multiple
"instances" of Corosync on server C, such that it participates in two
separate clusters?

Thanks for your patience. I had no idea this would end up being so
complicated. "3-node cluster" is much easier to say than to configure,
apparently. :-)

Eric Robinson

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