Compaq ProLiant Clusters for SCO UnixWare 7 U/200 Quick Install Guide for the Compaq ProLiant ML350

Managing Clusters 4-11
Compaq Confidential – Need to Know Required
Writer: Rachel Williams Project: Compaq ProLiant Clusters for SCO UnixWare 7 U/200 Quick Install Guide for the Compaq ProLiant ML350
Comments: Part Number: 223094-001 File Name: e-ch4 Managing Clusters.doc Last Saved On: 12/27/00 10:32 AM
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
UPS_SERIAL_PORT
configuration of:
UPS_SERIAL_PORT=/dev/tty00.1:/dev/tty00.2
where /dev/tty00.1 is the device identifier for the node 1 serial port tied to
UPS 1, and
/dev/tty00.2 is the device identifier for the node 2 serial port tied to
UPS 2.
Ethernet Crossover
Cable
UPS 1
Node 1
UPS 2
Node 2
CI Serial Cable
Serial
Cable
Serial
Cable
Figure 4-1. Power system for two-node cluster
NOTE: The public network connections are intentionally not shown.