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

Configuring Expand-Over-ServerNet Lines
Expand Configuration and Management Manual — 529522-013
12 - 4
Network Control Process ($NCP)
Network Control Process ($NCP)
The network control process ($NCP) initiates and terminates server-to-server
connections and maintains network-related system tables, including routing
information. $NCP must be running at every node in the Expand network before
Expand lines can be started.
Cluster Switch
A cluster switch is a 12-port network switch designed for use in ServerNet networks. In
a ServerNet cluster, a cluster switch provides the physical junction point that enables
multiple nodes to connect to the network. For more information on the cluster switch,
see the ServerNet Cluster Manual (for the 6770 cluster switch) or the ServerNet
Cluster 6780 Planning and Installation Guide .
Profile Products
To create a ServerNet cluster that operates with other Expand line types, order
individual profile products for the line types you are using. Profile products include
those in Table 12-1:
ServerNet Cluster Monitor Process ($ZZSCL)
The ServerNet cluster monitor process, $ZZSCL, monitors and responds to events
relevant to ServerNet cluster operations and is responsible for discovering and
managing the cluster.
The ServerNet cluster monitor process is not limited to a p
articular processor pair; it
can migrate within a user-specified set. A member of a ServerNet cluster monitor
process pair can go down without its processor going down. If both primary and
backup processes fail, the ServerNet monitor can be absent for a short period, until the
Note. The Integrity NonStop NS1000 server does not support ServerNet clusters.
Table 12-1. Profile Products Needed for Compatibility With Other Expand Lines
Profile Line Types Supported
Expand/ServerNet (T0509H0x) Expand-over-ServerNet Required for everyone
Expand/SWANgroup (T0532H0x) X.25
NETDIRECT
NETSATELLITE
IP
ATM
Required for new users
Expand/FastPipe (T0533H0x) IP
ATM
Required for new users
Note. The Integrity NonStop NS1000 server does not support ServerNet clusters.