Using Serviceguard Extension for RAC, 4th Edition, February 2007

Serviceguard Configuration for Oracle 10g RAC
Creating a Storage Infrastructure with CVM
Chapter 2 79
Creating a Storage Infrastructure with CVM
In addition to configuring the cluster, you create the appropriate logical
volume infrastructure to provide access to data from different nodes.
This is done with Logical Volume Manager (LVM), Veritas Volume
Manager (VxVM), or Veritas Cluster Volume Manager (CVM). LVM and
VxVM configuration are done before cluster configuration, and CVM
configuration is done after cluster configuration.
This section shows how to configure storage using the Veritas Cluster
Volume Manager (CVM). The examples show how to configure RAC disk
groups, but you can also create CVM disk groups for non-RAC use. For
more information, including details about configuration of plexes
(mirrors), multi-pathing, and RAID, refer to the HP-UX documentation
for the Veritas Volume Manager.
Initializing the Veritas Volume Manager
If you are about to create disk groups for the first time, you need to
initialize the Volume Manager. This is done by creating a disk group
known as rootdg that contains at least one disk. Use the following
command after installing CVM on each node:
# vxinstall
This displays a menu-driven program that steps you through the CVM
initialization sequence. From the main menu, choose the “Custom”
option, and specify the disk you wish to include in rootdg.
IMPORTANT Creating a rootdg disk group is only necessary the first time you use the
Volume Manager. CVM 4.1 does not require a rootdg.
Using CVM 4.x or later
This section has information on how to prepare the cluster and the
system multi-node package with CVM 4.x or later only (without the CFS
filesystem); (on HP-UX releases that support them; see “About Veritas
CFS and CVM” on page 22).