Managing Serviceguard 14th Edition, June 2007

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5222
NOTE If you are configuring volume groups that use mass storage on HP's HA
disk arrays, you should use redundant I/O channels from each node,
connecting them to separate ports on the array. As of HP-UX 11i v3, the
I/O subsystem performs load balancing and multipathing automatically.
Creating a Storage Infrastructure with LVM
This section describes storage configuration with LVM. It includes
procedures for the following:
• Creating Volume Groups for Mirrored Individual Disks
• Distributing Volume Groups to Other Nodes
The Event Monitoring Service HA Disk Monitor provides the capability
to monitor the health of LVM disks. If you intend to use this monitor for
your mirrored disks, you should configure them in physical volume
groups. For more information, refer to the manual Using High
Availability Monitors (http://docs.hp.com -> 11i v2-> Mission
Critical Operating Environment -> Event Monitoring Service
and HA Monitors).
Creating Volume Groups for Mirrored Individual Data Disks
The procedure described in this section uses physical volume groups
for mirroring of individual disks to ensure that each logical volume is
mirrored to a disk on a different I/O bus. This kind of arrangement is
known as PVG-strict mirroring. It is assumed that your disk hardware
is already configured in such a way that a disk to be used as a mirror
copy is connected to each node on a different bus from the bus that is
used for the other (primary) copy.
For more information on using LVM, refer to the Logical Volume
Management volume of the HP-UX System Administrator’s Guide.
You can use the System Management Homepage to create or extend
volume groups and create logical volumes. From the System
Management Homepage, choose Disks and File Systems. Make sure
you create mirrored logical volumes with PVG-strict allocation.