Using Serviceguard Extension for RAC Version A.11.20 - (August 2011)

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 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 15)).
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.
NOTE: For specific CFS Serviceguard Storage Management Suite product information refer to
your version of the HP Serviceguard Storage Management Suite Release Notes.
Volume Planning with CVM
Storage capacity for the Oracle database must be provided in the form of volumes located in
shared disk 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 volumes, which are located in disk groups that are shared
between the nodes in the cluster. High availability is achieved by using high availability disk arrays
in RAID nodes. The logical units of storage on the arrays are accessed from each node through
multiple physical volume links via DMP (Dynamic Multipathing) that provides redundant paths to
each unit of storage.
Planning Storage for Oracle 10g/11gR1/11gR2 RAC 31