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

4-10 Compaq ProLiant Clusters for SCO UnixWare 7 U/200 Quick Install Guide for the Compaq ProLiant ML350
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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
Configuring SCO UnixWare 7 NonStop Clusters
for UPS-Initiated Shutdown
The UPS-initiated shutdown is configured by modifying the OS_SHUTDOWN,
UPS_LOG_FILE, and UPS_SERIAL_PORT parameters within the
/opt/compaq/etc/nscupsd.cfg configuration file.
The
OS_SHUTDOWN parameter specifies the battery backup power remaining
when a cluster-wide shutdown is initiated. For example, an entry of
OS_SHUTDOWN=15 indicates that a cluster-wide shutdown is initiated when the
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
OS_SHUTDOWN.
The
UPS_LOG_FILE parameter specifies the file containing event information
related to UPS state transitions. This parameter defaults to
/var/spool/compaq/nscupsd.log and must not be modified.
The
UPS_SERIAL_PORT parameter identifies:
■ The serial ports to which the UPSs are connected
■ The combination of UPS signals required to shut down the cluster
The
UPS_SERIAL_PORT parameter is set equal to a listing of serial ports that is
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
UPS_SERIAL_PORT parameter.