Managing Serviceguard 11th Edition, Version A.11.16, Second Printing June 2004

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 113
NOTE The HP-UX Logical Volume Manager is described in Managing Systems
and Workgroups. A complete description of VERITAS volume
management products is available in the VERITAS Volume Manager for
HP-UX Release Notes.
HP-UX Logical Volume Manager (LVM)
Logical Volume Manager (LVM) is the legacy storage management
product on HP-UX. Included with the operating system, LVM is available
on all cluster nodes. It supports the use of MirrorDisk/UX, which is an
add-on product that allows disk mirroring with up to two mirrors (for a
total of three copies of the data).
Currently, the HP-UX root disk can be configured as an LVM volume
group. (Note that, in this case, the HP-UX root disk is not the same as
the VERITAS root disk group, rootdg, which must be configured in
addition to the HP-UX root disk on any node that uses VERITAS Volume
Manager products.) The Serviceguard cluster lock disk also is configured
using a disk configured in an LVM volume group.
LVM continues to be supported on HP-UX single systems and on
Serviceguard clusters.
VERITAS Volume Manager (VxVM)
The Base VERITAS Volume Manager for HP-UX (Base-VXVM) is
provided at no additional cost with HP-UX 11i. This includes basic
volume manager features, including a Java-based GUI, known as vmsa.
It is possible to configure cluster storage for Serviceguard with only
Base-VXVM. However, only a limited set of features is available.
The add-on product, VERITAS Volume Manager for HP-UX (B9116AA),
provides a full set of enhanced volume manager capabilities in addition
to basic volume management. This includes features such as mirroring,
dynamic multipathing for active/active storage devices, and hot
relocation. The VERITAS FastResync Option for HP-UX (B9118AA) is
another add-on product, available with an additional charge, that
reduces the time taken to resynchronize a split mirror to the volume.
This product requires the purchase of VERITAS Volume Manager for
HP-UX (B9116AA).