ServerNet Cluster 6780 Operations Guide (G06.28+, H06.05+)

Glossary
ServerNet Cluster 6780 Operations Guide—525606-003
Glossary-24
ServerNet node
ServerNet node. A system (node) in a ServerNet cluster. See also node and ServerNet
cluster.
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 SCF or
the OSM Service Connection, 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 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
ServerNet router in a NonStop S-series server has either six router ports (see
ServerNet router 1) or twelve router ports (see ServerNet router 2).
ServerNet router 1. A model of ServerNet router that, in a NonStop S-series server, has a
total of six input and six output ServerNet ports. A ServerNet router 1 is never an end
device. See also ServerNet router 2.
ServerNet router 2. A model of ServerNet router that, in a NonStop S-series server, has a
total of twelve input and twelve output ServerNet ports. A ServerNet router 2 is never
an end device. See also ServerNet router 1.
ServerNet subdevice. An I/O device that sends and receives its information through a
controlling device that acts as the ServerNet device for routing purposes.
ServerNet subdevice ID. The low-order bits (for example, the two least significant bits) of a
ServerNet ID, used by a ServerNet device to distribute incoming and outgoing
information between itself and its associated subdevices.