Availability Guide for Problem Management

Glossary
Availability Guide for Problem Management–125509
Glossary-3
downtime
downtime. Time during which the NonStop system is not capable of doing useful work
because of a planned or unplanned outage. From the end user’s perspective, downtime
is any time the application is not available. The cost of downtime can be dramatic in lost
revenue, lost consumer confidence, and lost productivity.
DSM. See Distributed Systems Management.
DSAP. See Disk Space Analysis Program (DSAP).
DSMS. See Distributed Systems Management Solutions (DSMS).
EMS. See Event Management Service (EMS).
EMSA. See Event Management Service Analyzer (EMSA).
Enform. A report generator.
entity. A resource measured by Measure.
environmental outage class. An outage class that includes failures in power, cooling,
network connections, natural disasters (earthquake, flood), terrorism, and accidents.
Event Management Service (EMS). The processes, procedures, and utilities used to report
and log events; to forward, print, and distribute event messages to applications; and to
filter, retrieve, and obtain information from event messages.
Event Management Service Analyzer (EMSA). A conversational interface that is used to
select and analyze events from EMS log files, such as subsystem ID, event number, text,
and start and stop time.
event message. The message generated by a subsystem when a subsystem detects an event
that might affect its operation. These messages are generally formatted with tokens.
Expand. Tandem’s NonStop network that extends the concept of fault-tolerant operation to
networks of geographically distributed NonStop systems. If the network is properly
designed, communications paths are constantly available, even in the event of a single
line or component failure.
fault tolerance. The ability of a Tandem NonStop system to continue processing despite the
failure of any single software or hardware component within the system.
file. A logical construct subject to operations such as reading and writing. The term file is
most commonly used to refer to data stored on a disk, but on the NonStop system,
processes, devices, and various other entities are also defined as files.
file system. A set of system procedures that run as part of a user’s process and send messages
to other processes, such as input/output (I/O) processes.
File Utility Program (FUP). A Tandem product that allows users to create, copy, purge, and
otherwise manipulate disk files interactively.