Managing Serviceguard Fifteenth Edition, reprinted May 2008

Planning and Documenting an HA Cluster
CVM and VxVM Planning
Chapter 4152
CVM and VxVM Planning
You can create storage groups using the HP-UX Logical Volume Manager
(LVM, described in the previous section), or using Veritas VxVM and
CVM software.
NOTE Check the Serviceguard, SGeRAC, and SMS Compatibility and Feature
Matrix and the latest Release Notes for your version of Serviceguard for
up-to-date information on CVM support: http://www.docs.hp.com ->
High Availability -> Serviceguard.
When designing a storage configuration using CVM or VxVM disk
groups, consider the following:
• You must create a rootdg disk group on each cluster node that will
be using VxVM storage. This is not the same as the HP-UX root disk,
if an LVM volume group is used. The VxVM root disk group can only
be imported on the node where it is created. This disk group is
created only once on each cluster node.
NOTE The VxVM rootdg is only required for VxVM 3.5 and earlier; it is not
required for VxVM 4.1 and later.
• CVM disk groups are created after the cluster is configured, whereas
VxVM disk groups may be created before cluster configuration if
desired.
• High availability applications, services, and data should be placed in
separate disk groups from non-high availability applications,
services, and data.
• You must not group two different high availability applications,
services, or data, whose control needs to be transferred
independently, onto the same disk group.
• Your HP-UX root disk can belong to an LVM or VxVM volume group
(starting from VxVM 3.5) that is not shared among cluster nodes.