Managing Serviceguard Fifteenth Edition, reprinted May 2008

Building an HA Cluster Configuration

Preparing Your Systems

Chapter 5 223

Initializing the Veritas Cluster Volume Manager 3.5

NOTE Check the Serviceguard, SGeRAC, and SMS Compatibility and Feature

Matrix and the latest Release Notes for your version of Serviceguard for

up-to-date information about support for CVM (and CFS - Cluster File

System): http://www.docs.hp.com -> High Availability ->

Serviceguard).

If you are using CVM 3.5 and 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 once only, immediately after installing

VxVM on each node:

vxinstall

This displays a menu-driven program that steps you through the VxVM

initialization sequence. From the main menu, choose the “Custom”

option, and specify the disk you wish to include in rootdg.

IMPORTANT The rootdg for the Veritas Cluster Volume Manager 3.5 is not the same

as the HP-UX root disk if an LVM volume group is used for the HP-UX

root disk filesystem. Note also that rootdg cannot be used for shared

storage. However, rootdg can be used for other local filesystems (e.g.,

/export/home), so it need not be wasted. (CVM 4.1 and later do not

require you to create rootdg.)

Note that you should create a rootdg disk group only once on each node.

Converting Disks from LVM to VxVM

You can use the vxvmconvert(1m) utility to convert LVM volume groups

into VxVM disk groups. Before you can do this, the volume group must be

deactivated, which means that any package that uses the volume group

must be halted. Follow the conversion procedures outlined in the Veritas

Volume Manager Migration Guide for your version of VxVM. Before you

start, be sure to create a backup of each volume group’s configuration

with the vgcfgbackup command, and make a backup of the data in the

volume group. See “Migrating from LVM to VxVM Data Storage” on

page 511 for more information about conversion.