Using Serviceguard Extension for RAC, 5th Edition, June 2007

Serviceguard Configuration for Oracle 10g RAC
Planning Storage for Oracle 10g RAC
Chapter 250
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