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

Serviceguard Configuration for Oracle 9i RAC
Planning Database Storage
Chapter 3130
Planning Database Storage
The files needed by the Oracle database must be placed on shared
storage that is accessible to all RAC cluster nodes. This section shows
how to plan the storage using SLVM, Veritas CFS, or Veritas CVM.
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 (and one undo tablespace for Oracle9) 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.