Compaq ProLiant 1600 Administrator's Manual page 47

2-16 Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide
Recommended Cluster Communication Strategy
The past two sections discussed the redundancy of intracluster and
cluster-to-LAN communication. However, to obtain the most benefit while
minimizing cost and complexity, view cluster communications as a single
entity.
To create redundancy for both intracluster and cluster-to-LAN
communication, first, employ physical hardware redundancy for the LAN
NICs. Second, configure MSCS to use both the primary and redundant
LAN NIC as backup for intracluster communication.
With this strategy, your cluster can continue normal operations (without a
failover event) when each of the following points of failure are encountered:
Failure of the interconnect card
Failure of the port on the interconnect card
Failure of the interconnect cable
Failure of the port on the LAN NIC
Failure of the LAN NIC (if redundant NICs, as opposed to dual-ported
NICs, are used)
Failure of the Ethernet cable running from a cluster node to the Ethernet
hub (which connects to the LAN)
The following examples describe how to physically set up your cluster nodes
to employ the Compaq-recommended strategy. For more information about the
strategy, refer to the Compaq White Paper, "Increasing Availability of Cluster
Communications in a Windows NT Cluster."