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

Serviceguard Configuration for Oracle 10g RAC

Cluster Communication Network Monitoring

Chapter 272

Guidelines for Changing Cluster Parameters

This section describes the guidelines for changing the default values of

certain Oracle clusterware and Serviceguard cluster configuration

parameters.

The guidelines vary depending on whether clustering interconnect

subnet monitoring is used to monitor the CSS HB subnet or not.

When Cluster Interconnect Subnet Monitoring is used

The Cluster Interconnect Subnet Monitoring feature is used:

1. to monitor the CSS-HB network and

2. if any of the following cluster parameters needs to be changed the

default values of:

• Oracle Clusterware parameter CSS misscount

• Serviceguard cluster configuration parameter

NODE_TIMEOUT

• Serviceguard HEARTBEAT_INTERVAL

Then the CSS misscount parameter should be the greater of either:

• 195 seconds

• 40 times Serviceguard NODE_TIMEOUT plus 25 times Serviceguard

HEARTBEAT_INTERVAL + 120 seconds

When Cluster Interconnect Subnet Monitoring is not used

The Cluster Interconnect Monitoring is not used:

1. to monitor the CSS HB subnet and

2. if the default values of any of the following parameters has to be

changed:

• Oracle Clusterware parameter CSS misscount