HP Integrity NonStop H-Series - Manual (Page 226)

Operations and Management
HP AutoSYNC User’s Guide—522580-021
A-4
The AutoSYNC Monitor
The AutoSYNC Monitor
The AutoSYNC monitor manages scheduled synchronizations. Initially, the monitor is
started when the MapDB is created. The AutoSYNC monitor is a fault-tolerant process
pair, so it should not require restarting unless it is stopped or a system coldload is
performed.
As described in Update the System Coldload and Shutdown Procedures on page 2-8,
the system coldload procedures should start the monitor process. It should be started
after TMF.
If synchronization is to occur between different systems, the monitor process must be
configured and running on all the participating systems. It must also have the same
process name.
Configuring the Monitor Process
The monitor is configured and started when the MapDB is created through the
CREATE MAPDB command. The monitor has an assigned default process name,
$ZASY, reserved for AutoSYNC.
The monitor configuration can be changed by using the ALTER MONITOR command.
You can configure process priority, process CPUs, and the monitor event-logging
device.
You can also configure alternate monitor processes to create different synchronization
environments. See
Configuring and Using an Alternate AutoSYNC Environment below
for details.
Configuring Monitor Priority
The monitor caches all configuration information in memory and has efficient lookup
algorithms; thus, each communication is usually a simple message and requires little
cpu time and no disk I/O. The monitor can process many information requests without
imposing a significant load on the system.
The monitor process task is limited to scheduling synchronizations so it consumes very
little system resources. It can be run at the same priority as other monitor type
processes in the system such as Pathmon.
Configuring Monitor Hometerm
The monitor logs events to the EMS collector $0. You may configure event logging to
another collector or to a facility similar to the HP NonStop Virtual Hometerm
Subsystem, by altering the hometerm of the monitor, for example:
ALTER MONITOR, HOMETERM $VHS;
To configure the monitor to log messages to an alternate EMS collector you can also
set the global parameter EMSCOLLECTOR using the
ALTER GLOBAL command.