Introduction to NonStop Operations Management

Glossary
Introduction to NonStop Operations Management–125507
Glossary-11
remote mirroring
remote mirroring. A pair of mirrored disk drives that are used together as a single logical
drive in which the primary drive and the backup (mirror) drive are located in
geographically distinct (remote) locations. Each byte of data written to the primary drive
is also written to the mirror drive. If the primary drive fails, the mirror drive can
continue operations. By providing geographic separation of mirrored volumes, remote
mirroring protects the database from local environment hazards.
Remote Server Call (RSC). A Tandem product that facilitates client/server computing,
allowing personal computer (PC) or workstation applications running in Microsoft
Windows, Windows NT, Winsock, MS-DOS, OS/2, UNIX, and Apple Macintosh
operating environments to access Pathway server classes and operating-system
processes. Transactions are transmitted from the PC or workstation application (the
client) to a Pathway application running on a Tandem NonStop system (the server) using
a supported communications protocol, such as network basic input-output system
(NETBIOS), Transmission Control Protocol/Internet Protocol (TCP/IP), or an
asynchronous connection.
SAFECOM. The Safeguard command interpreter.
Safeguard. A security tool that provides users of Tandem systems and distributed networks
with a set of services for protecting the components of the system or network from
unauthorized use. Safeguard services include authentication, authorization, and auditing.
SCF. See Subsystem Control Facility (SCF).
SCP. See Subsystem Control Point (SCP).
screen program. A program that controls screen displays on input and output devices and
processes, accepts data from these devices and processes, and transmits the data and
requests to other programs that operate upon a database.
SEB. See ServerNet Expansion Board (SEB).
security management. Activities that provide support for establishing and maintaining
system security. One of the operations disciplines in the operations management model.
See operations management model.
SeeView Server Gateway (SSG). The host component of the CSG/SSG message transport
mechanism. The SSG, working with CSG on the workstation, routes messages from
workstation clients to appropriate host server processes and returns responses. Together,
CSG and SSG provide a message transport mechanism between the workstation and the
host that is independent of the underlying communication protocol.
server. A group of Pathway server processes that receives and reacts to transaction requests
from screen programs.
ServerNet Expansion Board (SEB). A connector board that plugs into the backplane to
allow one or more ServerNet cables to exit the rear of the enclosure.