Managing HP Serviceguard for Linux Ninth Edition, April 2009

5. Run vgscan:

vgscan

NOTE: At this point, the setup for volume-group activation protection is complete.

Serviceguard adds a tag matching the uname -n value of the owning node to

each volume group defined for a package when the package runs and deletes the

tag when the package halts. The command vgs -o +tags vgname will display

any tags that are set for a volume group.

The sections that follow take you through the process of configuring volume groups

and logical volumes, and distributing the shared configuration. When you have

finished that process, use the procedure under “Testing the Shared Configuration”

(page 167) to verify that the setup has been done correctly.

Building Volume Groups: Example for Smart Array Cluster Storage (MSA 2000 Series)

NOTE: For information about setting up and configuring the MSA 2000 for use with

Serviceguard, see the HP Serviceguard for Linux Version A.11.19 Deployment Guide on

docs.hp.com under High Availability —> Serviceguard for Linux —>

White Papers.

Use Logical Volume Manager (LVM) on your system to create volume groups that can

be activated by Serviceguard packages. This section provides an example of creating

Volume Groups on LUNs created on MSA 2000 Series storage. For more information

on LVM, see the Logical Volume Manager How To, which you can find at http://

tldp.org/HOWTO/HOWTO-INDEX/howtos.html

Before you start, partition your LUNs and label them with a partition type of 8e (Linux

LVM). Use the type t parameter of the fdisk command to change from the default

of 83 (Linux).

Do the following on one node:

1. Update the LVM configuration and create the /etc/lvmtab file. You can omit

this step if you have previously created volume groups on this node.

vgscan

NOTE: The files /etc/lvmtab and /etc/lvmtab.d may not exist on some

distributions. In that case, ignore references to these files.

2. Create LVM physical volumes on each LUN. For example:

pvcreate -f /dev/sda1

pvcreate -f /dev/sdb1

pvcreate -f /dev/sdc1

164 Building an HA Cluster Configuration