Using Serviceguard Extension for RAC, 7th Edition, September 2008

the network and will perform a local LAN failover (transparent to CSS and RAC) if the primary
interface fails.
NOTE: A package with the CLUSTER_INTERCONNECT_SUBNET parameter is available for both
Modular and Legacy packages. A package with this parameter can be configured only when all
nodes of the cluster are running SGeRAC version A.11.18 or higher. For more information, see
the latest edition of the Managing Serviceguard Fifteenth Edition user’s guide at
http://docs.hp.com. -> High Availability.
Figure 2-1 Single Network for Cluster Communications
Alternate Configuration - Fast Reconfiguration with Low Node Timeout
A high RAC-IC traffic may interfere with SG-HB traffic and cause unneccessary node timeouts
if Serviceguard cluster configuration parameter NODE_TIMEOUT is low. If NODE_TIMEOUT cannot
be increased, use of an additional network dedicated for SG-HB alone avoids unnecessary node
timeouts when RAC-IC traffic is high. This configuration is for a cluster with two or more nodes
that have high RAC-IC traffic and need fast failover (a low value for Serviceguard configuration
parameter NODE_TIMEOUT).
Cluster Communication Network Monitoring 37