Managing Serviceguard 12th Edition, March 2006

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3118
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 default 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 3.5 products. The rootdg is no longer required with VERITAS
Volume Manager 4.1 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 VEA. 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 (B9116BA,
B9117BA), 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.
VxVM can be used in clusters that:
• are of any size, up to 16 nodes.