NonStop System Glossary

ServerNet Cluster
See HP NonStop ServerNet Cluster (ServerNet Cluster).
ServerNet cluster monitor process (SNETMON)
A process pair with the process name $ZZSCL that manages the state of the ServerNet cluster
subsystem. Each node (system) in a ServerNet cluster must have one SNETMON process pair
running.
ServerNet cluster services
The functions necessary to allow a node to join, participate in, or leave a NonStop ServerNet
Cluster. These functions include monitoring and control of the physical connections to the cluster,
discovery of other nodes in the cluster, and automatic recovery of failed connections.
ServerNet cluster subsystem
The subsystem managed by the ServerNet cluster monitor process (SNETMON). The subsystem
name is SCL. The subsystem number is 218. The subsystem identifier is ZSCL.
ServerNet device
Interface logic that is associated with a specific hardware unit, such as a processor or I/O adapter,
and that provides the interface to the ServerNet communications network. The responsibilities of
the ServerNet device are to transform message data into ServerNet packets, to transmit those
packets, to receive ServerNet packets, and to unpack the data on behalf of the associated hardware
unit. See also ServerNet subdevice.
ServerNet device adapter (ServerNet/DA)
A ServerNet adapter that controls external devices. The 6760 ServerNet/DA contains up to four
ServerNet addressable controllers (SACs), each of which can control either disk drives or tape
drives.
ServerNet device ID
See ServerNet ID.
ServerNet diagram
A graphical layout of the logical connections between objects in the system. These objects can
include processors, ServerNet routers, ServerNet adapters, disks on the SCSI bus, and so on.
ServerNet dump
To copy the memory of a processor to disk by using the ServerNet fabrics.
ServerNet end device
See ServerNet device.
ServerNet expansion board (SEB)
1. A connector board that plugs in to the backplane to allow one or more ServerNet cables to
exit the rear of the enclosure. The SEBs and ServerNet cables allow processors in one group to
communicate with processors in another group. Each SEB provides either the ServerNet X fabric
or the ServerNet Y fabric for a group.
2. A collective term for both SEBs and modular SEBs (MSEBs) when a distinction between the two
types of SEBs is not required.
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