Using Serviceguard Extension for RAC, 10th Edition, April 2013

Figure 7 Single Network for Cluster Communications
Alternate Configuration—Fast Reconfiguration with Low Node Member Timeout
High RAC-IC traffic may interfere with SG-HB traffic and cause unnecessary member timeout if
Serviceguard cluster configuration parameter MEMBER_TIMEOUT is low. If MEMBER_TIMEOUT
cannot be increased, use of an additional network dedicated for SG-HB alone avoids unnecessary
member 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/or need faster failover (a low value for Serviceguard
configuration parameter MEMBER_TIMEOUT).
NOTE: Starting with Serviceguard A.11.19, the faster failover capability is in core Serviceguard.
This configuration can be used for faster failover.
Figure 8 SG-HB/RAC-IC Traffic Separation
Each primary and standby pair protects against a single failure. With the SG-HB on more than
one subnet, a single subnet failure will not trigger a Serviceguard reconfiguration. If the subnet
with CSS-HB fails, unless subnet monitoring is used, CSS will resolve the interconnect subnet failure
38 Serviceguard Configuration for Oracle 10gR2, 11gR1, or 11gR2 RAC