NOTE: Check the Serviceguard/SGeRAC/SMS/Serviceguard Manager Plug-in Compatibility and Feature Matrix and the latest Release Notes for your version of Serviceguard for up-to-date information on CVM support: http://www.hp.com/go/hpux-serviceguard-docs.

When designing a storage configuration using CVM or VxVM disk groups, consider the following:

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 that is not shared among cluster nodes.

A cluster lock disk must be configured into an LVM volume group; you cannot use a VxVM or CVM disk group. (See “Cluster Lock Planning” (page 98) for information about cluster lock options.)

VxVM disk group names should not be entered into the cluster configuration file. These names are not inserted into the cluster configuration file by cmquerycl.

CVM and VxVM Worksheet

You may find a worksheet such as the following useful to help you organize and record your specific physical disk configuration. This worksheet is an example; blank worksheets are in Appendix E (page 369).

=========================================================================

Disk Group Name: ______dg01_____________________

Disk Name: _____________________c1t2d0__________________________

Disk Name: _____________________c2t2d0__________________________

Disk Name: _____________________c3t2d0__________________________

Disk Name: _____________________________________________________

CFS DG Package Name: ___________SG-CFS-DG_1_____

CFS Volume, MP, and MP Pkg: _logdata_/mnt/lvol1_ SG-CFS-MP_1______

CFS Volume, MP, and MP Pkg: ______________________________________

Disk Group Name: ______dg02______________________

Disk Name: _____________________c1t3d0__________________________

Disk Name: _____________________c2t3d0__________________________

Disk Name: _____________________c3t3d0__________________________

CFS DG Package Name: ___________SG-CFS-DG_2_____

CFS Volume, MP, and MP Pkg: _hrdata__/mnt/lvol4_ SG-CFS-MP_2____

CFS Volume, MP, and MP Pkg: ____________________________________

Cluster Configuration Planning

A cluster should be designed to provide the quickest possible recovery from failures. The actual time required to recover from a failure depends on several factors:

The value of the cluster MEMBER_TIMEOUT.

See MEMBER_TIMEOUT under “Cluster Configuration Parameters ” (page 109) for recommendations.

The availability of raw disk access. Applications that use raw disk access should be designed with crash recovery services.

The application and database recovery time. They should be designed for the shortest recovery time.

Cluster Configuration Planning 103

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HP Serviceguard manual Cluster Configuration Planning, CVM and VxVM Worksheet