Managing Serviceguard Seventeenth Edition, First Reprint December 2009

the system sends the packet through the interface on which the unbound packet
was received.
This means that the packet source addresses (and therefore the interfaces on a
multihomed host) affect the selection of a gateway for outbound packets once
ip_strong_es_model is enabled. For more information see “Using a Relocatable
Address as the Source Address for an Application that is Bound to INADDR_ANY”
(page 401).
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)” (page 106).
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 /usr, /swap, etc., 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:
204 Building an HA Cluster Configuration