NET/MASTER Management Services (MS) System Management Guide

Managing the Activity Log Message Queue
Managing Activity Logs
105744 Tandem Computers Incorporated 10–7
Second, NonStop NET/MASTER MS may read EMS messages arriving from the EMS
consumer distributor and send the messages to the queue more rapidly than the
messages can be logged. The solution to this problem is to suspend the reading of
EMS messages when the queue increases to a specified size, and to resume the reading
of EMS messages when the queue decreases to a specified size. Two SYSPARMS are
available to control the reading of EMS messages destined for the activity log:
LOGHIWATER, which specifies the size to which the queue can grow before the
reading of EMS messages is suspended. The reading of EMS messages is
suspended when the total number of messages in the queue is greater than the
number specified by LOGHIWATER.
LOGLOWATER, which specifies the size to which the queue must decrease before
the reading of EMS messages can resume. The reading of EMS messages resumes
when the total number of messages in the queue is equal to the number specified
by LOGLOWATER.
Note Although all messages destined for the activity log affect the size of the activity log message queue, the
LOGHIWATER and LOGLOWATER system parameters affect only EMS messages.
For example, assume you use the following commands to set the values of the
LOGHIWATER and LOGLOWATER system parameters:
SYSPARMS LOGHIWATER=300
SYSPARMS LOGLOWATER=50
If the total number of messages in the queue is greater than 300, the reading of EMS
messages is suspended. If the total number of messages in the queue is less than 50,
the reading of EMS messages resumes.