Expand Configuration and Management Manual (H06.21+, J06.10+)

Configuring Expand-Over-ServerNet Lines
Expand Configuration and Management Manual — 529522-013
12 - 2
Required Hardware and Software
Required Hardware and Software
Several hardware and software components are required in addition to the Expand-
over-ServerNet line-handler process to provide Expand-over-ServerNet connectivity.
Figure 12-1 illustrates the process of a local application sending a message to a
remote node.
Figure
12-1 depicts a local node consisting of three processors: Processor 1 is running
an application, Processor 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 processor switches, 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.
Figure 12-1. Expand-Over-ServerNet Connectivity Components
Note. The Integrity NonStop NS1000 server does not support ServerNet clusters.
X Fabric
Expand/ServerNet
Line-Handler
Guardian
Message System
$ZZSCL
Application
Remote Node
Processor 1 Processor 2 Processor 3
Local Node
Y Fabric
Cluster Switch
Processor ...
VST047.vsd
Cluster Switch