Using Serviceguard Extension for RAC, 7th Edition, September 2008

A failure of CSS-HB/RAC-IC network in such configuration does not force Serviceguard to reform
the cluster. If Serviceguard is not configured to monitor the network, Oracle will take at least
CSS misscount time interval to resolve the network failure. The default value of CSS misscount
in SGeRAC configurations is 600 seconds.
To avoid longer recovery times, manage Oracle Clusterware and RAC-DB instances using
Serviceguard multi-node packages. In addition, configure the CLUSTER_INTERCONNECT_SUBNET
package configuration parameter (as done with a standard SUBNET package configuration
parameter) in the respective multi-node packages to monitor the CSS-HB/RAC-IC networks.
Planning Storage for Oracle Cluster Software
Oracle Cluster Software requires shared storage for the Oracle Cluster Registry (OCR) and a vote
device. Automatic Storage Management can not be used for the OCR and vote device since these
files must be accessible before Oracle Cluster Software starts. The minimum required size for
the OCR is 100MB and for the vote disk is 20 MB. The Oracle OCR and vote device can be created
on supported shared storage, including SLVM logical volumes, CVM raw volumes, and CFS file
systems (on HP-UX releases that support Veritas CFS and CVM; see “About Veritas CFS and
CVM from Symantec” (page 18)).
Planning Storage for Oracle 10g RAC
Volume Planning with SLVM
Storage capacity for the Oracle database must be provided in the form of logical volumes located
in shared volume groups. The Oracle software requires at least two log files for each Oracle
instance, several Oracle control files and data files for the database itself. For all these files,
Serviceguard Extension for RAC uses HP-UX raw logical volumes, which are located in volume
groups that are shared between the nodes in the cluster. High availability is achieved by using
high availability disk arrays in RAID modes. The logical units of storage on the arrays are accessed
from each node through multiple physical volume links (PV links, also known as alternate links),
which provide redundant paths to each unit of storage.Fill out a Logical Volume worksheet to
provide logical volume names for logical volumes that you will create with the lvcreate
command. The Oracle DBA and the HP-UX system administrator should prepare this worksheet
together. Create entries for shared volumes only. For each logical volume, enter the full pathname
of the raw logical volume device file. Be sure to include the desired size in MB. Following is a
sample worksheet filled out. However, this sample is only representative. For different versions
of the Oracle database, the size of files are different. Refer to Appendix B: “Blank Planning
Worksheets”, for samples of blank worksheets. Make as many copies as you need. Fill out the
worksheet and keep it for future reference.
Storage Planning with CFS
With CFS, the database software, database files (control, redo, data files), and archive logs may
reside on a cluster file system visible by all nodes. Also, the OCR and vote device can reside on
CFS directories.
The following software needs to be installed in order to use this configuration:
• SGeRAC
• CFS
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 18)).
32 Serviceguard Configuration for Oracle 10g RAC