Managing Serviceguard A.11.20, March 2013

is enabled. For more information see “Using a Relocatable Address as the Source Address
for an Application that is Bound to INADDR_ANY” (page 355).
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.
IMPORTANT: This must be done, as described below, whether or not you intend to use
cmpreparestg (1m) to configure storage. See “Using Easy Deployment Commands to Configure
the Cluster” (page 167) for more information about cmpreparestg.
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)” (page 81).
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
4. Mirror the boot, primary swap, and root logical volumes to the new bootable disk. Ensure
that all devices in vg00, such as those for /usr, /swap, are mirrored.
NOTE: The boot, root, and swap logical volumes must be done in exactly the following
order to ensure that the boot volume occupies the first contiguous set of extents on the new
disk, followed by the swap and the root.
The following is an example of mirroring the boot logical volume:
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c4t6d0
The following is an example of mirroring the primary swap logical volume:
lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/c4t6d0
The following is an example of mirroring the root logical volume:
lvextend -m 1 /dev/vg00/lvol3 /dev/dsk/c4t6d0
5. Update the boot information contained in the BDRA for the mirror copies of boot, root and
primary swap.
/usr/sbin/lvlnboot -b /dev/vg00/lvol1
/usr/sbin/lvlnboot -s /dev/vg00/lvol2
/usr/sbin/lvlnboot -r /dev/vg00/lvol3
6. Verify that the mirrors were properly created.
lvlnboot -v
The output of this command is shown in a display like the following:
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c4t5d0 (10/0.5.0) -- Boot Disk
/dev/dsk/c4t6d0 (10/0.6.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c4t5d0
Preparing Your Systems 177