HP Serviceguard Extension for RAC (SGeRAC) manual Serviceguard Extension for RAC Architecture

are supported are those specified by Hewlett-Packard, and you can create your own multi-node packages. For example, the packages HP supplies for use with the Veritas Cluster Volume Manager (CVM) and the Veritas Cluster File (CFS) System (on HP-UX releases that support Veritas CFS and CVM. Also, see “About Veritas CFS and CVM from Symantec” (page 15)).

•Multi-node package. A system multi-node package must run on all nodes that are active in the cluster. If it fails on one active node, that node halts. A multi-node package can be configured to run on one or more cluster nodes. It is considered UP as long as it is running on any of its configured nodes.

NOTE: In RAC clusters, you create packages to start and stop Oracle Clusterware and RAC itself as well as to run applications that access the database instances. For details on the use of packages with Oracle Clusterware and RAC, refer to “RAC Instances” (page 28)

Serviceguard Extension for RAC Architecture

This chapter discusses the main software components used by Serviceguard Extension for RAC. The following is a list of components:

•Oracle Components

◦Custom Oracle Database

•Serviceguard Extension for RAC Components

◦Group Membership Services (RAC)

•Serviceguard Components

◦Package Manager

◦Cluster Manager

◦Network Manager

•Operating System

◦Volume Manager Software

◦HP-UX Kernel

Group Membership Daemon

In addition to the Serviceguard daemon processes mentioned in Chapter 3 of the Managing Serviceguard user’s guide, there is another daemon that is used by Oracle to enable communication with Serviceguard Extension for RAC:

•cmgmsd—Group Membership Daemon for RAC 10g or later

This HP daemon provides group membership services for Oracle Real Application Cluster 10 g or later. Group membership allows multiple Oracle instances to run on the same cluster node. GMS is illustrated in Figure 2 (page 13).

Overview of SGeRAC and Cluster File System (CFS)/Cluster Volume Manager (CVM)

SGeRAC supports Veritas Cluster File System (CFS)/Cluster Volume Manager (CVM) from Symantec through Serviceguard. CFS and CVM are not supported on all versions of HP-UX (on HP-UX releases that support Veritas CFS and CVM). For more information, see “About Veritas CFS and CVM from Symantec” (page 15)).

For information on configuring CFS and CVM with Serviceguard, refer to the latest edition of the Managing Serviceguard user’s guide at www.hp.com/go/hpux-serviceguard-docs—> HP Serviceguard.

14 Introduction to Serviceguard Extension for RAC