Using Serviceguard Extension for RAC, 5th Edition, June 2007

Serviceguard Configuration for Oracle 10g RAC
Network Planning for Cluster Communication
Chapter 248
• RAC GCS (cache fusion) traffic may be very high, so an additional
dedicated heartbeat network for Serviceguard needs to be
configured.
• Some networks, such as Infiniband, are not supported by CFS/CVM,
so the CSS-HB/RAC-IC traffic may need to be on a separate network
that is different from SG-HB network.
• SGeFF requires a dual Serviceguard heartbeat network, and
CSS-HB/RAC-IC does not support multiple networks for HA
purposes.
• In a multiple database configuration, RAC-IC traffic of one database
may interfere with RAC-IC traffic of another database, so the
RAC-IC traffic of databases may need to be separated.
In the above cases, you will see a longer time to recover some network
failures beyond those protected by primary and standby, unless
Serviceguard is configured to monitor the network.
A failure of CSS-HB/RAC-IC network in such configuration does not
force Serviceguard to reform the cluster. If Serviceguard is not
configured to monitor the network, Oracle will take at least CSS
misscount time interval to resolve the network failure. The default value
of CSS misscount in SGeRAC configurations is 600 seconds.
To avoid longer recovery times, manage Oracle Clusterware and
RAC-DB instances using Serviceguard multi-node packages. In addition,
configure the CLUSTER_INTERCONNECT_SUBNET package configuration
parameter (as done with a standard SUBNET package configuration
parameter) in the respective multi-node packages to monitor the
CSS-HB/RAC-IC networks.