HP Serviceguard Extension for RAC (SGeRAC) manual Oracle Cluster Software, Shared Storage

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 a 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 initiates its own recovery action as needed, and propagates the new group membership to the RAC instances.

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.

NOTE: IMR timeout as a configurable parameter has been deprecated in Oracle 11gR1 and later.

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.

Automated Oracle Cluster Software Startup and Shutdown

The preferred mechanism that allows Serviceguard to notify Oracle Cluster Software to start and to request Oracle Cluster Software to shutdown is the use of Serviceguard packages using SGeRAC toolkit.

Monitoring

Oracle Cluster Software daemon monitoring is performed through programs initiated by the HP-UX init process. SGeRAC monitors Oracle Cluster Software to the extent that CSS is a NMAPI2 group membership client and group member. SGeRAC provides group membership notification to the remaining group members when CSS enters and leaves the group membership.

Allowed Characters for Oracle 10g/11gR1/11gR2 RAC Cluster Names

Oracle Clusterware uses SGeRAC Group Membership Service to get the node status, it registers a group in SGeRAC cmgmsd daemon with Oracle cluster name. Since the valid group name in SGeRAC only allows alpha letter (a-z, A-Z), decimal digital (0-9), underscore (_), dollar sign ($) and number sign(#), only these characters are allowed in Oracle 10g/11gR1/11gR2 Clusterware cluster name.

Shared Storage

SGeRAC supports shared storage using HP Shared Logical Volume Manager (SLVM), Cluster File System (CFS), Cluster Volume Manager (CVM), and ASM (ASM/SLVM in 11i v2/v3 and ASM over raw disks in 11i v3). CFS and CVM are not supported on all versions of HP-UX (on HP-UX releases that support them). See “About Veritas CFS and CVM from Symantec” (page 15).

26 Serviceguard Configuration for Oracle 10g, 11gR1, or 11gR2 RAC