Compaq ProLiant DL380 Quick Install Manual page 65

Two-Node Cluster with a Single Power Supply in
Each Node
When using a two-node cluster with two UPSs, as shown in Figure 4-1,
configure the UPSs so that the cluster shuts down only if both UPSs are low
on power. The loss of a single physical UPS results in the loss of one of the
nodes but not the loss of the cluster. In this configuration, both UPSs are
combined into a single logical UPS, which results in a
configuration of:
UPS_SERIAL_PORT=/dev/tty00.1:/dev/tty00.2
where is the device identifier for the node 1 serial port tied to
/dev/tty00.1
UPS 1, and
/dev/tty00.2
UPS 2.
Serial
Cable
UPS 1
Figure 4-1. Power system for two-node cluster using ServerNet I cluster
interconnect
is the device identifier for the node 2 serial port tied to
Node 1
CI Serial
Cable
Dedicated
Serial
ServerNet I Cables Cable
UPS 2
Managing Clusters 4-11
UPS_SERIAL_PORT
Node 2