Managing Serviceguard 12th Edition, March 2006

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.
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
• 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.
• The cluster lock disk can only be configured with an LVM volume
group.
• VxVM disk group names should not be entered into the cluster
configuration ASCII file. These names are not inserted into the
cluster configuration ASCII file by cmquerycl.