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

Glossary
Expand Configuration and Management Manual — 529522-013
Glossary - 11
ServerNet adapter
ServerNet adapter. A component that connects peripheral devices to the rest of the system
through a ServerNet bus interface (SBI).
ServerNet cluster. ServerNet clusters enable multiple NonStop NS-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.
ServerNet cluster monitor process. The manager process, called $ZZSCL, for the
ServerNet cluster subsystem on NonStop NS-series servers. $ZZSCL is responsible
for maintaining configuration information about a ServerNet cluster.
SH. See split horizon (SH).
single-line path. A path that consists of one line. See also line, path, and route. Contrast
multi-line path.
split horizon (SH). An alternative routing algorithm provided by the Expand subsystem. The
main advantage of SH is that alternate paths are immediately known (temporary
discontinuity never occurs). The main disadvantage of SH is that it increases the
occurrence of loop routing. See also modified split horizon (MSH).
stack. A portion of the Expand line-handler process data space. The Expand subsystem
allocates 700 words to the stack.
superpath. In Expand, the SUPERPATH modifier enables the multi-CPU path feature. See
also multipacket frame.
TF. See time factor (TF).
throughput. The amount of traffic that can be handled by an Expand line-handler process.
time factor (TF). A number assigned to a line, path, or route to indicate efficiency in
transporting data. The lower the TF, the more efficient the line, path, or route.
variable packet size. A feature that allows Expand nodes to send packets that can exceed
the size of a normal Expand packet. The variable packet size feature is enabled using
the PATHPACKETBYTES modifier. It should be enabled when you are sending large
blocks of data. Contrast multipacket frame.
$NCP. The process name of the network control process.
$ZZCIP. The management process for the Cluster I/O Protocols subsystem.
$ZEXP. The process name of the Expand manager process.
$ZNET. The process name of the default Subsystem Control Point (SCP).
$ZNUP. The process name of the network utility process.