Sample Configuration with HP Serviceguard Extension for RAG and Oracle Real Application Clusters 11g release 2 using Cluster File System

Figure 2 shows a configuration that addresses the possibility that heavy RAC-DB-IC traffic may affect

SG-HB, illustrating one way to overcome the heavy RAC-DB-IC traffic affecting the SG-HB. This

configuration uses two SG-HB networks. With multiple SG-HB networks, SG

MEMBER_TIMEOUT can be

set as short as the systems allow, enabling faster cluster reformation. The subnet for the CSS-HB and

RAC-DB-IC has redundancy with the primary and standby adapters and switches that are configured.

If the primary (LAN1) fails, SG performs a local LAN failover to the standby (LAN2). If a node fails,

SG detects the failure from the loss of the SG-HB.

If both the primary (LAN1) and the standby (LAN2) fail, SG logs the failure but will not take action

unless SG packages with monitored subnets are configured to take action. The advantage of SG

taking action on a monitored subnet is that the failure detection can be faster than the CSS-HB

timeout, which means recovery will be quicker. A separate package can be configured to monitor

the CSS-HB subnet using cluster interconnect subnet monitoring with

node_fail_fast_enabled set to

YES. SG will monitor the CSS-HB subnet through this package and fail the node upon failure of the

CSS-HB subnet. If this package is being configured, the SG package that is configured for OC should

have the

same_node “up” dependency on it. If this package is configured with the name

CI-PACKAGE, then the SG package configured for OC should have the following dependency:

dependency_name CI-PACKAGE-DEP

dependency_condition CI-PACKAGE=up

dependency_location same_node

If there are no SG packages configured to take action, a CSS-HB timeout occurs, whereupon CSS

goes through reconfiguration and reboots the node that is not part of the CSS cluster membership.

When the node reboots, SG will evict that node and reform the cluster with the new membership.

Figure 3. Dual primary and standby Ethernet, including GAB/LLT