Technical data

Using DNS to Balance Work Load
6.5 Configuring the Load Broker
• The number of DNS cluster member hosts is limited to 32.
• A BIND name server can also be a DNS cluster member host.
• The authoritative name server can run any BIND name server that supports
BIND 8.1.1 or later or that supports dynamic updates.
6.5.2 Load Broker Logical Names
Table 6–2 describes the load broker’s logical names. Define these logical names
with the /SYSTEM qualifier, and restart the load broker server to make the
changes take effect.
Table 6–2 Load Broker Logical Names
Logical Name Description
TCPIP$LBROKER_LOG_LEVEL value Turns on diagnostics and writes them to
the TCPIP$LBROKER_RUN.LOG located in
SYS$SYSDEVICE:[TCPIP$LD_BKR]. Valid
values are 1 and 2 (2 provides more detailed
diagnostics).
6.5.3 Metric Server Logical Names
Table 6–3 describes the metric server’s logical names. Define these logical
names with the /SYSTEM qualifier. The metric server detects the change and
dynamically updates the current enviroment.
Table 6–3 Metric Server Logical Names
Logical Name Description
TCPIP$METRIC_CPU_RATING value Sets a bias value that represents your
estimate of the relative CPU power.
Valid values range from 1 (lowest
CPU power) to 100 (highest CPU
power). Use a value of 0 (zero) to
specify the default (The value of the
system parameter IJOBLIM is used).
TCPIP$METRIC_COMPUTE_INTERVAL value Specifies how often the metric server
computes the rating. Valid value (in
seconds) is a number from 1 to 300.
The default is 10 seconds.
TCPIP$METRIC_LOG_LEVEL value Turns on diagnostics logged to the file
TCPIP$METRIC_RUN.LOG located
in SYS$SPECIFIC:[TCPIP$METRIC].
Valid values are 1 or 2 (2 provides
more detailed diagnostics).
6.6 Metric Server Startup and Shutdown
The metric server starts up automatically at system startup time if the service
was previously enabled and can be shut down and started independently.
The following files are provided:
• SYS$STARTUP:TCPIP$METRIC_STARTUP.COM allows you to start up the
metric service.
6–8 Using DNS to Balance Work Load