HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

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