Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-ServerNet Lines
Expand Configuration and Management Manual—523347-008
12-2
Expand Manager Process ($ZEXP)
Figure 12-1 depicts a local node consisting of three processors: Processor 1 is running
an application, Procesor 2 is running the ServerNet cluster monitor process ($ZZSCL),
and Processor 3 is running an Expand-over-ServerNet line handler.
The application makes a communications request to the message system. The
message system forwards the request to the Expand-over-ServerNet line handler,
which in turn forwards the request to the ServerNet cluster monitor process ($ZZSCL).
The line handler and $ZZSCL provide the various security permissions to allow the
message system to send the message outside the node. The message system then
forwards the communications request to the MSEBs, through the NonStop Cluster
Switches, and out on the line to the remote node.
The message system at the remote node sends the request to its line handler and
$ZZSCL process for permissions, then forwards it to the remote application.
The components shown for this communications request and other components
necessary for Expand-over-ServerNet lines are described as follows.
Expand Manager Process ($ZEXP)
The Expand subsystem requires that the Expand manager process ($ZEXP) be
running during network operation. For information on running this process, see Task 2:
Start the Expand Manager Process on page 1-2.
External System Area Network Manager (SANMAN)
The External System Area Network Manager (SANMAN) is a new process pair that
runs in every NonStop S-series server connected to a ServerNet cluster. SANMAN
provides the services needed to manage the external ServerNet fabrics and the
system’s access to the fabrics. SANMAN:
•
Manages the external ServerNet fabrics.
•
Initializes, monitors, configures, and controls the NonStop Cluster Switches.
•
Communicates with other processes or objects that require information from or
about the external fabrics.
Message Monitor Process (MSGMON)
MSGMON is a new monitor process that resides in each processor of a server and
executes various functions required by the message system. MSGMON is a helper for
the ServerNet cluster subsystem. MSGMON handles communications between the
ServerNet monitor (SNETMON) and individual processors. MSGMON also logs events
from and generates events on behalf of the IPC subsystem.