QIO Configuration and Management Manual

QIO Configuration and Management Manual—424717-008
Glossary-1
Glossary
API. See application program interface (API).
appearance side. The side of an HP NonStop™ S-series system enclosure that contains
disk customer-replaceable units (CRUs) and the power monitor and control unit
(PMCU) CRUs that do not require cables. The appearance side always has a short
door and panel, or a tall door, that is required for cooling the enclosure. The
appearance side is opposite the service side. The appearance-side door is lockable for
security purposes. See also service side.
application program interface (API). A set of services (such as programming language
functions or procedures) that are called by an application program to communicate with
other software components. For example, an application program in the form of a client
might use an API to communicate with a server program.
Asynchronous Transfer Mode (ATM). A transfer mode in which the information is
organized into cells. It is asynchronous in the sense that the recurrence of cells
containing information from an individual user is not necessary periodic.
ATM 3 ServerNet adapter (ATM3SA). A ServerNet adapter that provides access to
Asynchronous Transfer Mode (ATM) networks from an HP NonStop™ S-series system
enclosure. The 3860 ATM3SA supports the ATM User-Network Interface (UNI)
specification over a 155-megabit/second (Mbps) OC-3 Sonet (Synchronous Optical
Network) connection.
attribute. (1) For the Subsystem Control Facility (SCF), a characteristic of an entity. For
example, two attributes of a process might be its program file and its user ID. An
attribute is sometimes called a modifier. (2) In OSM client interfaces, a data item
associated with a system or cluster resource. All attributes can be viewed and some
can be modified.
backup processor. A processor running the NonStop OS 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.
base address. An address in memory that is the starting point of a memory segment.
Class-1 CRU. A customer-replaceable unit (CRU) that probably will not cause a partial or
total system outage if the documented replacement procedure is not followed correctly.
Customers replacing Class-1 CRUs do not require previous experience with replacing
HP NonStop™ S-series CRUs. However, for some CRUs, customers must be able to
use the tools needed for the replacement procedure (which are common tools) and
must protect components from electrostatic discharge (ESD).
Class-2 CRU. A customer-replaceable unit (CRU) that might cause a partial or total system
outage if the documented replacement procedure is not followed correctly. Customers
replacing Class-2 CRUs should have either three or more months of experience with