Managing HP Serviceguard A.11.20.10 for Linux, December 2012

Figure 5 Mirrored Disks Connected for High Availability
2.4 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.
30 Understanding Hardware Configurations for Serviceguard for Linux