6760 ServerNet/DA Manual

Glossary
6760 ServerNet/DA Manual—424879-003
Glossary-81
ServerNet ID
ServerNet ID. A unique identifier for an addressable unit on a ServerNet communications
network. A unit can have multiple ServerNet node IDs. This ID is used for routing: each
packet has a source ServerNet node ID and a destination ServerNet node ID. Note
that a pair of processors operating in duplex mode share one ServerNet node ID.
ServerNet LAN Systems Access (SLSA) subsystem. A subsystem of the HP NonStop™
Kernel operating system for configuration and management of ServerNet local area
network (LAN) objects in G-series release version updates (RVUs).
ServerNet link. Two unidirectional point-to-point communication paths, one in each
direction, connecting a router to a ServerNet node or another router. Each ServerNet
link contains a transmit channel and a receive channel.
ServerNet memory interface (SMI). An application-specific integrated circuit (ASIC) that
provides the interface between the microprocessor and the two ServerNet fabrics and
main memory.
ServerNet node. A system in a ServerNet cluster. See also node.
ServerNet node number. A number that identifies a member system in a ServerNet cluster.
The ServerNet node number is a simplified expression of the six-bit node-routing ID
that determines the node to which a ServerNet packet is routed. The ServerNet node
number is assigned based on the port to which the node is connected on the
ServerNet II Switch. The ServerNet node number, which can be viewed using
Subsystem Control Facility (SCF) or the Compaq TSM Service Application, is unique
for each node in a ServerNet cluster.
ServerNet node routing ID. A bit field used to route ServerNet packets across the external
ServerNet X and Y fabrics. The ServerNet node routing ID occupies the upper six bits
of the 20-bit ServerNet ID, and it is unique for each member, or node, in a ServerNet
cluster. This term is the fully qualified form of “node routing ID.”
SERVERNET object type. In the Kernel subsystem, the object type for either the $ZSNET
ServerNet subsystem manager process or the ServerNet X fabric or Y fabric.
ServerNet packet. A unit of information consisting of a header, an address field, a
0-to-64-byte data field, and a 32-bit cyclic redundancy check (CRC) checksum.
ServerNet packets negotiate the network by using a technique called wormhole
routing.
ServerNet port. A connector used for ServerNet links. Six ServerNet ports are located on a
ServerNet expansion board (SEB). Ten ServerNet ports are located on a modular
ServerNet expansion board (MSEB).
ServerNet router. An application-specific integrated circuit (ASIC) responsible for routing
ServerNet packets along ServerNet links in the ServerNet fabrics, using routing
information that is present within the packets. A ServerNet router acts as a fully duplex
crossbar switch, able to switch any of its input ports to any of its output ports. A