Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-ServerNet Lines
Expand Configuration and Management Manual—523347-008
12-4
ServerNet Cluster Monitor Process ($ZZSCL)
ServerNet Cluster Monitor Process ($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 particular 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 may be absent for a short period, until
the persistence manager starts a new ServerNet cluster monitor process. Since data
traffic does not involve the ServerNet monitor, it could continue during this time.
$ZZSCL must be configured and started before the Expand-over-ServerNet
line-handler processes can be started. For information about configuring $ZZSCL, refer
to the ServerNet Cluster Manual.
ServerNet Cluster Product
ServerNet clusters enable multiple NonStop S-series servers to work together and
appear to client applications as one large processing entity. ServerNet clusters extend
the ServerNet X and Y fabrics outside the system boundary and allow the ServerNet
protocol to be used for intersystem messaging. For more information on the ServerNet
Cluster product, refer to the ServerNet Cluster Manual.
Wide Area Network (WAN) Subsystem
You create an Expand-over-ServerNet line-handler process by adding it as a device to
the WAN subsystem. For each node in a ServerNet cluster, you must create one
Expand-over-ServerNet line-handler process for every other node in the cluster. The
WAN subsystem is preconfigured and started during the system load sequence. For
information about the WAN subsystem, refer to the WAN Subsystem Configuration and
Management Manual.
Table 12-1. Profile Products Needed for Compatibility With Other Expand Lines
Profile Line Types Supported
Expand/ServerNet (T0509G06) Expand-over-ServerNet Required for everyone
Expand/SWANgroup (T0532G06) X.25
NETDIRECT
NETSATELLITE
IP
ATM
FOX
Required for new users
Expand/FastPipe (T0533G06) IP
ATM
FOX
Required for new users