Best Practices for SGeRAC and Oracle RAC on HP-UX 11i, March 2009

• RAC GCS (cache fusion) traffic may be very high, so a separate network for RAC-DB-IC may be

needed.

One RAC-DB-IC may interfere with another RAC-DB-IC on the same cluster. RAC-DB-IC

may also interfere with heartbeat traffic.

• Some networks are not supported by CFS/CVM, so the RAC-DB-IC traffic may be on a separate

network.

• Certain kinds of fast re-configurations require a minimum of two Serviceguard heartbeat networks,

whereas CSS-HB and RAC-DB-IC do not support multiple network for HA purposes.

Note:

Starting with A.11.19, the faster failover capability is integrated as part of

the base Serviceguard product.

In these cases, you may see longer recovery times for some kinds of network failure (other than those

managed by Serviceguard's primary-standby mechanism), unless you develop special logic to handle

them."

Common configuration

When a single network is sufficient to address the internal interconnect bandwidth requirements, the

recommended choice is to use a single network for SG-HB, CSS-HB, RAC-DB-IC, for ASM-IC when

ASM is used and GAB/LLT when CFS/CVM is used.

Figure 2. Common configuration

This configuration is the most common configuration. There is one network and the network has

sufficient bandwidth. If there are multiple databases, then they will also use the same interconnect.

The primary-and standby-pair protects against single failure. Serviceguard monitors the network and

performs local LAN failover if the primary fails. The local LAN failover is transparent to CSS and

RAC. When ASM is used, ASM-IC traffic is on the same network as CSS-HB. When CFS/CVM is

used, GAB/LLT traffic is on the same network as SG-HB. Here, both CSS-HB and SG-HB are on the

same network.

See CLUSTER_INTERCONNECTS, page 5-11, Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide

version 10g Release 2 (10.2) (http://download-west.oracle.com/docs/cd/B19306_01/rac.102/b14197.pdf ); See also Administering

Multiple Cluster Interconnects on Linux and UNIX Platforms, page 3-16, Oracle Real Application Clusters Administration and Deployment Guide

11g Release 1 (11.1) B28254-04, November 2007 (http://download.oracle.com/docs/cd/B28359_01/rac.111/b28254.pdf)

Node A

LAN 1

LAN 2

Node B

LAN 1

LAN 2

CSS-HB

RAC-DB-IC

Private

(standby)

Private

(primary)