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

Introduction to Serviceguard Extension for RAC
Overview of SGeRAC and Cluster File System (CFS)/Cluster Volume Manager (CVM)
Chapter 1 21
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” on
page 22).
For information on configuring CFS and CVM with Serviceguard, refer
to the Managing Serviceguard Twelfth Edition user’s guide at
http://docs.hp.com -> High Availability -> Serviceguard.
Package Dependencies
When CFS is used as shared storage, the application and software using
the CFS storage should be configured to start and stop using
Serviceguard packages. These application packages should be configured
with a package dependency on the underlying multi-node packages,
which manages the CFS and CVM storage reserves.
Configuring the application to be start/stop through SG package is to
ensure the synchronization of storage activation/deactivation and
application startup/shutdown.
With CVM configurations using multi-node packages, CVM shared
storage should be configured in Serviceguard packages with package
dependencies.
Refer to the Managing Serviceguard Twelfth Edition user’s guide on
HP-UX 11i v2 for detailed information on multi-node packages.
Storage Configuration Options
Prior to CFS, the only option in a SGeRAC cluster to provide shared
storage for a RAC cluster was through raw volumes, using either SLVM
or CVM that are used for Oracle data files. The application software is
installed on a local file system. In addition to SLVM and CVM, SGeRAC
supports CFS.