Three node cluster interconnect options?
I'm going to be implementing two different three node clusters to provide HA for a number of java application servers and their hosted applications. The current plan is to use two nodes of each cluster as the master for a subset of applications and have the third node be failover for the first two nodes. Each node will be running RHEL 5.3 64-bit.
I've implemented simple two node clusters in the past and used cross over cables to enable the LLT interconnect. I'm curious as to how the interconnect can be configured in a three node setup. Is it a requirement that it be switched? If it must be switched and I use two interfaces per node, should each of the interfaces be cabled into a different switch? This would seem to cause the ISL in my switches to have to carry the LLT traffic, but using only one switch would be a single point of failure. Is using cross over cables in a meshed configuration a viable solution to interconnect in a three or more node cluster?
Any pointers are appreciated