Open SCSI Integrator's Manual for NonStop S-Series Servers

Glossary
Open SCSI Integrator’s Manual for NonStop Servers—422988-002
Glossary-21
ServerNet diagram
contains up to four ServerNet addressable controllers (SACs), each of which can control
either disk drives or tape drives.
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 using the ServerNet system
area network (ServerNet SAN).
ServerNet expansion board (SEB). 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.
ServerNet/FX adapter. A ServerNet adapter that logically extends the ServerNet X and Y
fabrics to other clusters in a Fiber Optic Extension (FOX) ring using fiber-optic lines.
Two ServerNet/FX adapters are used, one for the X ring and one for the Y ring.
ServerNet LAN Systems Access (SLSA) subsystem. A subsystem of the NonStop operating
system for configuration and management of ServerNet local area network (LAN)
objects in G-series releases.
ServerNet link. A segment of a ServerNet system area network (ServerNet SAN) that
connects a ServerNet node to a ServerNet router or connects a router to a 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. An endpoint in a ServerNet system area network (ServerNet SAN).
ServerNet nodes send and receive ServerNet packets.
ServerNet node ID. A unique identifier for an addressable unit on a ServerNet system area
network (ServerNet SAN). 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 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 system area network (ServerNet
SAN). 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, address, and destination, and source fields to identify the
processor or I/O device transmitting and receiving the packet.