Using Serviceguard Extension for RAC, 9th Edition, September 2010

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 Serviceguard 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 latest edition of the Managing Serviceguard user’s guide for detailed information on
multi-node packages.
Storage Configuration Options
CFS provides SGeRAC with additional options, such as improved manageability. When planning
a RAC cluster, application software could be installed once and be visible by all cluster nodes.
A central location is available to store runtime logs, for example, RAC alert logs.
Oracle RAC data files can be created on a CFS, allowing the database administrator or Oracle
software to create additional data files without the need of root system administrator privileges.
The archive area can be on a CFS. Oracle instances on any cluster node can access the archive
area when database recovery requires the archive logs.
About Veritas CFS and CVM from Symantec
Veritas Cluster File System (CFS) and Cluster Volume Manager (CVM) are supported on some,
but not all current releases of HP-UX. Check the latest Release Notes for your version of
Serviceguard for up-to-date information at www.hp.com/go/hpux-serviceguard-docs
—> HP Serviceguard Extension for RAC.
CAUTION: Once you create the disk group and mount point packages, you must administer
the cluster with CFS commands, including cfsdgadm, cfsmntadm, cfsmount, and cfsumount.
You must not use the HP-UX mount or umount command to provide or remove access to a
shared file system in a CFS environment. Using these HP-UX commands under these
circumstances is not supported. Use cfsmount and cfsumount instead.
If you use the HP-UX mount and umount commands, serious problems could occur, such as
writing to the local file system instead of the cluster file system. Non-CFS commands could cause
conflicts with subsequent CFS command operations on the file system or the Serviceguard
packages, and will not create an appropriate multi-node package, which means cluster packages
will not be aware of file system changes.
Overview of SGeRAC and Oracle 10g, 11gR1, and 11gR2 RAC
Starting with Oracle 10g RAC, Oracle has bundled its own cluster software. The initial release
is called Oracle Cluster Ready Service (CRS). CRS is used both as a generic term referring to the
Oracle Cluster Software and as a specific term referring to a component within the Oracle Cluster
Software. At subsequent release, Oracle generic CRS is renamed to Oracle Clusterware. Oracle
Clusterware is the generic term referring to the Oracle Cluster Software.
The Oracle Cluster Software includes the following components: Cluster Synchronization Services
(CSS), Cluster Ready Service (CRS), and Event Management (EVM).
CSS manages the Oracle cluster membership and provides its own group membership service
to RAC instances. When installed on a SGeRAC cluster, CSS utilizes the group membership
service provided by SGeRAC.
18 Introduction to Serviceguard Extension for RAC