NET/MASTER Management Services (MS) Command Reference Manual

LBANNER
SYSPARMS LOGHIWATER
NonStop NET/MASTER MS Commands
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LOGHIWATER
LOGHIWATER= number
specifies the size to which the activity log message queue can grow before the
reading of EMS messages is suspended.
When NonStop NET/MASTER MS receives (reads) messages, the messages are
sent to a queue before being written to a log. Because messages can be read at a
faster rate than they can be written, the message queue can grow rapidly, thus
reducing the efficiency of NonStop NET/MASTER MS.
The solution to this problem is to suspend the reading of EMS messages when the
message queue increases to a specified size, hold them and to resume the reading
of EMS messages when the message queue decreases to a specified size. The value
of the SYSPARMS LOGHIWATER parameter determines the point at which
NonStop NET/MASTER MS temporarily suspends the reading of EMS messages.
It is important to note that, although all messages affect the length of the message
queue, only EMS messages are suspended.
The value of the LOGHIWATER operand must be a number from 50 through
32,000. The default value is 500.
Considerations
The SYSPARMS LOGHIWATER command is used in conjunction with the
SYSPARMS LOGLOWATER command.
It is possible (although not desirable) to set the LOGHIWATER value to be less
than the LOGLOWATER value. This combination causes NonStop NET/MASTER
MS to suspend each incoming message until the previous message has been
written.
Example
The following example sets the LOGLOWATER value to 50 and the LOGHIWATER
value to 300:
SYSPARMS LOGHIWATER=300
SYSPARMS LOGLOWATER=50