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Glossary
automatic volume recognition (AVR). The process your system uses to check tape labels
when a tape is mounted on a tape drive. AVR checks the label to ensure that the correct
tape is mounted on the correct tape drive. If an incorrect tape is mounted, the system
rejects the tape and displays an operator message.
AVR. See
automatic volume recognition
BACKCOPY. A utility program that allows you to duplicate tapes made with the BACKUP
utility. With BACKCOPY, you can create up to two duplicate tapes for archiving,
distribution, or disaster recovery.
BACKUP. A utility program that copies disk files onto magnetic tape.
backup processor. A processor in a NonStop™ Kernel operating system that communicates
with the primary processor, allowing the processors to remain independent. A
component failure in one processor has no effect on any other processor. See
processor.
central processing unit (CPU). See processor.
client/server architecture. A computer architecture that divides work between a client and a
server. The client provides application and user interface resources; the server stores,
retrieves, and protects data. Client/server architecture enables users to access shared data
and resources. Clients and servers run on a local area network. See
computing.
client/server computing. A model for distributing applications. Communication takes the
form of request and reply pairs, which are initiated by the client and serviced by the
server. Client/server computing is often used to connect different types of workstations
or personal computers to the host computer system, using supported communications
protocols. In the NonStop™ Kernel environment, the Remote Server Call product
allows a client process (for example, a workstation application) to access a server (for
example, a Pathway server). See
collector. (1) An EMS collector is an Event Management Service (EMS) process that accepts
event messages from subsystems and logs them in an event log. (2) A spooler collector
accepts output from applications and store the output on disk. Each spooler must include
at least one collector but can contain multiple collectors
command file. An edit file (file code 101) that contains a series of TACL commands in the
order you want to execute them. To execute the commands in the file, you either use the
OBEY command and give the name of the file, or you name the file as the input file
when you run TACL. Using command files is a method of automating operations tasks.
communications subsystem. The combination of data communications hardware and
software processes that function together as an integrated unit to provide services and
access to wide and local area networks.
(AVR).
client/server architecture.
Guardian User's Guide —425266-001
Glossary -2
automatic volume recognition (AVR)
primary
client/server
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