Using Serviceguard Extension for RAC, 4th Edition, February 2007

Serviceguard Configuration for Oracle 10g RAC
Interface Areas
Chapter 2 37
CSS Timeout
When SGeRAC is on the same cluster as Oracle Cluster Software, the
CSS timeout is set to a default value of 600 seconds (10 minutes) at
Oracle software installation.
This timeout is configurable with Oracle tools and should not be changed
without ensuring that the CSS timeout allows enough time for
Serviceguard Extension for RAC (SGeRAC) reconfiguration and to allow
multipath (if configured) reconfiguration to complete.
On a single point of failure, for example, node failure, Serviceguard
reconfigures first and SGeRAC delivers the new group membership to
CSS via NMAPI2. If there is a change in group membership, SGeRAC
updates the members of the new membership. After receiving the new
group membership, CSS in turn initiates its own recovery action as
needed and propagates the new group membership to the RAC instances.
NOTE As a general guideline, the CSS TIMEOUT should be greater of either
180 seconds or 25 times the Serviceguard NODE_TIMEOUT.
RAC IMR Timeout
RAC instance IMR timeout is configurable. RAC IMR expects group
membership changes to occur within this time or IMR will begin evicting
group members. The IMR timeout must be above the SGeRAC
reconfiguration time and adhere to any Oracle-specified relation to CSS
reconfiguration time.
Oracle Cluster Software
Oracle Cluster Software should be started after activating its required
shared storage resources. Shared storage resources can be activated
after SGeRAC completes startup. Oracle Cluster Software should not
activate any shared storage. Similarly, for halting SGeRAC at run level 3
and removing shared storage resources from Oracle Cluster Software,
Oracle Cluster Software must be halted first.