Managing HP Serviceguard for Linux Ninth Edition, April 2009

Figure 2-2 Mirrored Disks Connected for High Availability
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.
36 Understanding Hardware Configurations for Serviceguard for Linux