HP Serviceguard manual Cluster Lock Planning, Power Supply Configuration Worksheet

units you are using and the power supply to which they will be connected; record the following information:

Host Name The host name for each SPU.

Disk Unit The disk drive unit number for each disk.

Tape Unit The tape unit number for each backup device.

Other Unit Tthe number of any other unit.

Power Supply The power supply unit number of the UPS to which the host or other device is connected.

Be sure to follow UPS and cabinet power limits as well as SPU power limits.

Power Supply Configuration Worksheet

You may find the following worksheet useful to help you organize and record your power supply configuration. This worksheet is an example; blank worksheets are in Appendix E. Make as many copies as you need.

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

SPU Power:

Host	Name	____ftsys9__________	Power	Supply	_____1_______________
Host	Name	____ftsys10_________	Power	Supply	_____2_______________

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

Disk Power:

Disk Unit __________1_______________	Power Supply ____3________________
Disk Unit __________2_______________	Power Supply ____4________________
Disk Unit __________________________	Power Supply _____________________
Disk Unit __________________________	Power Supply _____________________
Disk Unit __________________________	Power Supply _____________________
Disk Unit __________________________	Power Supply _____________________

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

Tape Backup Power:

Tape	Unit	__________________________	Power	Supply	_____________________
Tape	Unit	__________________________	Power	Supply	_____________________

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

Other Power:

Unit	Name	__________________________	Power	Supply	_____________________
Unit	Name	__________________________	Power	Supply	_____________________

Cluster Lock Planning

The purpose of the cluster lock is to ensure that only one new cluster is formed in the event that exactly half of the previously clustered nodes try to form a new cluster. It is critical that only one new cluster is formed and that it alone has access to the disks specified in its packages. You can specify an LVM lock disk, a lock LUN, or a Quorum Server as the cluster lock. For more information about the cluster lock, and requirements and recommendations, see “Cluster Lock ” (page 46).

NOTE: You cannot use more than one type of lock in the same cluster.

A one-node cluster does not require a lock. Two-node clusters require the use of a cluster lock, and a lock is recommended for larger clusters as well. Clusters larger than four nodes can use only a

98 Planning and Documenting an HA Cluster