Compaq 195294-001 - ProLiant - ML370R Quick Install Manual page 64

4-10 Compaq ProLiant Clusters for SCO UnixWare 7 U/300 Quick Install Guide for the Compaq ProLiant ML370
Configuring SCO UnixWare 7 NonStop Clusters
for UPS-Initiated Shutdown
The UPS-initiated shutdown is configured by modifying the
, and
UPS_LOG_FILE UPS_SERIAL_PORT
/opt/compaq/etc/nscupsd.cfg
The parameter specifies the battery backup power remaining
OS_SHUTDOWN
when a cluster-wide shutdown is initiated. For example, an entry of
indicates that a cluster-wide shutdown is initiated when the
OS_SHUTDOWN=15
UPS has only 15 minutes of battery backup power remaining. Measure the
time required for a clean shutdown of the cluster under peak operating
conditions to ensure that the shutdown time is adequate. Use this measurement
as a guide for setting the value of
The parameter specifies the file containing event information
UPS_LOG_FILE
related to UPS state transitions. This parameter defaults to
/var/spool/compaq/nscupsd.log
The parameter identifies:
UPS_SERIAL_PORT
I
The serial ports to which the UPSs are connected
I
The combination of UPS signals required to shut down the cluster
The parameter is set equal to a listing of serial ports that is
UPS_SERIAL_PORT
separated by colons and semicolons.
Colon-separated serial ports create a pair of UPSs in which both of the UPSs
must signal that they are low on power before a cluster shuts down. This pair
of UPSs is called a logical UPS. A logical UPS consists of UPSs that together
provide fully redundant power to a cluster. The drain of a single UPS within a
logical UPS does not result in the loss of any key cluster resources.
NOTE: Use a serial connection to a UPS in determining shutdown only if the node with the
serial port is an active member in the cluster.
Semicolon-separated serial ports identify a list of UPSs or logical UPSs. A
low-power indication by any of those UPSs results in a cluster-wide shutdown.
Use this parameter when a cluster spans multiple power domains and the loss
of any one domain results in a cluster-wide shutdown to protect the cluster.
The following section clarifies the use of the
parameters within the
configuration file.
OS_SHUTDOWN
and must not be modified.
UPS_SERIAL_PORT
OS_SHUTDOWN
.
parameter.
,