Managing HP Serviceguard for Linux, Eighth Edition, March 2008

Understanding Hardware Configurations for Serviceguard for Linux
Redundant Power Supplies
Chapter 2 35
Redundant Power Supplies
You can extend the availability of your hardware by providing battery
backup to your nodes and disks. HP-supported uninterruptible power
supplies (UPS) can provide this protection from momentary power loss.
Disks should be attached to power circuits in such a way that disk array
copies are attached to different power sources. The boot disk should be
powered from the same circuit as its corresponding node. Quorum server
systems should be powered separately from cluster nodes. Your HP
representative can provide more details about the layout of power
supplies, disks, and LAN hardware for clusters.