NonStop S-Series Server Description Manual (G06.24+)

Glossary
HP NonStop S-Series Server Description Manual—520331-003
Glossary-91
ServerNet LAN Systems Access (SLSA) subsystem
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 6-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 cluster
switch. The ServerNet node number, which can be viewed using the Subsystem
Control Facility (SCF), the OSM Service Connection, or the 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. The unit of transmission in a ServerNet communications network. A
ServerNet packet consists of a header, a variable-size data field, and a 32-bit cyclic
redundancy check (CRC) checksum covering the entire packet. The header contains
fields for control, virtual memory address, and destination and source fields to identify
the processor or I/O controller transmitting and receiving the packet. See also request
packet and response packet.
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
ServerNet router in an HP NonStop™ S-series server has either six router ports (see
ServerNet router 1) or twelve router ports (see ServerNet router 2).