Managing Serviceguard 13th Edition, February 2007

Building an HA Cluster Configuration

Preparing Your Systems

Chapter 5 199

files [NOTFOUND=continue UNAVAIL=continue] dns

[NOTFOUND=return UNAVAIL=return]

files [NOTFOUND=continue UNAVAIL=continue] nis

[NOTFOUND=return UNAVAIL=return]

This step is critical, allowing the cluster nodes to resolve hostnames

to IP addresses while DNS, NIS, or the primary LAN is down.

4. If no cluster exists on a system that you intend to configure into the

cluster, create a $SGCONF/cmclnodelist file on all nodes and allow

access by all cluster nodes. See “Using the cmclnodelist File” on

page 193.

Creating Mirrors of Root Logical Volumes

HP strongly recommends that you use mirrored root volumes on all

cluster nodes. The following procedure assumes that you are using

separate boot and root volumes; you create a mirror of the boot volume

(/dev/vg00/lvol1), primary swap (/dev/vg00/lvol2), and root volume

(/dev/vg00/lvol3). In this example and in the following commands,

/dev/dsk/c4t5d0 is the primary disk and /dev/dsk/c4t6d0 is the

mirror; be sure to use the correct device file names for the root disks on

your system.

NOTE Under agile addressing, the physical devices in these examples would

have names such as /dev/[r]disk/disk1

, and /dev/[r]disk/disk2.

See “About Device File Names (Device Special Files)” on page 115.

1. Create a bootable LVM disk to be used for the mirror.

# pvcreate -B /dev/rdsk/c4t6d0

2. Add this disk to the current root volume group.

# vgextend /dev/vg00 /dev/dsk/c4t6d0

3. Make the new disk a boot disk.

# mkboot -l /dev/rdsk/c4t6d0