Using Serviceguard Extension for RAC, 8th Edition, March 2009

There are also packages that run on several cluster nodes at once, and do not fail over. These are
called system multi-node packages and multi-node packages. As of Serviceguard Extension for
RAC A.11.19, the only non-failover packages that are supported are those specified by
Hewlett-Packard, 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; see “About Veritas CFS and CVM from Symantec” (page 18)).
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 RAC itself as well as to run
applications that access the database instances. For details on the use of packages with RAC,
refer to section, “Using Packages to Configure Startup and Shutdown of RAC Instances” (page 107)
located in chapter 3.
Serviceguard Extension for RAC Architecture
This chapter discusses the main software components used by Serviceguard Extension for RAC
in some detail. The components are:
• 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 9i or later
This HP daemon provides group membership services for Oracle Real Application Cluster 9i or
later. Group membership allows multiple Oracle instances to run on the same cluster node. GMS
is illustrated in Figure 1-2 (page 16).
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; see “About Veritas CFS and CVM from
Symantec” (page 18)).
For information on configuring CFS and CVM with Serviceguard, refer to the Managing
Serviceguard Sixteenth Edition user’s guide at http://docs.hp.com -> High Availability ->
Serviceguard.
Serviceguard Extension for RAC Architecture 17