Introduction to Networking for NonStop S-Series Servers

Glossary
Introduction to Networking for HP NonStop S-Series Servers—520670-005
Glossary-19
sensitive command
sensitive command. A command that can be issued only by a restricted set of users. For
HP communications subsystems, the sensitive commands are those that can change
the state or configuration of objects, start or stop tracing, or change the values of
statistics counters.
server. (1) An implementation of a system used as a stand-alone system or as a node in an
Expand network. (2) A combination of hardware and software designed to provide
services in response to requests from clients across the network. For example, the
NonStop range of servers provides transaction processing (TP), database access, and
other services. (3) A process or program that provides services to a client or a
requester.
server class. Servers are designed to receive request messages from clients or requesters;
perform the desired operations, such as database inquiries or updates, security
verifications, numerical calculations, or data routing to other computer systems; and
return reply messages to the clients or requesters. A server process is a running
instance of a server program.
ServerNet II Switch. A 12-port network switch that provides the physical junction point to
enable a NonStop S-series server to connect to a ServerNet cluster.
ServerNet adapter. A customer-replaceable unit (CRU) or field-replaceable unit (FRU) that
connects peripheral devices to the rest of a NonStop S-series server through a
ServerNet bus interface (SBI). A ServerNet adapter is similar in function to an
input/output (I/O) controller logical board (LB) and backplane interconnect card (BIC)
on a NonStop K-series server.
ServerNet cluster. A network of servers connected together using the ServerNet protocol,
and sharing a common transport for interprocessor communication across and within a
cluster. Offers fast end-to-end communication without intermediate protocol stacks,
achieving comparable speeds for internal and external ServerNet communication.
ServerNet clusters enable multiple NonStop S-Series servers to work together and
appear to client applications as one large processing entity. ServerNet clusters extend
the ServerNet X and Y fabrics outside the system boundary and allow the ServerNet
protocol to be used for intersystem messaging. See also cluster.
ServerNet Cluster. The abbreviated product name for the collection of hardware and
software components that constitute a ServerNet cluster. The full product name is HP
NonStop ServerNet Cluster. See also ServerNet cluster.
ServerNet addressable controller (SAC). A controller that is uniquely addressable within
one or more ServerNet address domains (SADs) through the node ID and address
fields in a request packet. A SAC is typically implemented on some portion of a
processor multifunction (PMF) customer-replaceable unit (CRU), an input/output (I/O)
multifunction (IOMF) CRU, or a ServerNet adapter.