SCF Reference Manual for the Storage Subsystem (G06.27+, H06.04+)

Glossary
SCF Reference Manual for the Storage Subsystem—529937-008
Glossary-4
enclosure
enclosure. Similar to a cabinet in HP NonStop K-series systems. An enclosure can contain
components of a system or a peripheral. Base enclosures are placed on the floor and
can have other enclosures stacked on top of them. Stackable enclosures can be
placed on top of other enclosures. See also system enclosure and peripheral
enclosure.
enclosure interleaving. On HP NonStop S-series systems, configuring a mirrored disk
volume to use two separate system enclosures. For internal disk drives, the two disk
drives of the mirrored volume can be in separate enclosures. For 45xx disk drives, the
adapters connected to the two disk drives of the mirrored volume can be in separate
enclosures.
Enterprise Storage System (ESS). A collection of magnetic disks, their controllers, and the
disk cache in a standalone cabinet or cabinets. These disks are configured by an
attached console and presented to the attached server as logical volumes that can be
a fraction of a physical volume or can span volumes.
error number. For the Subsystem Programmatic Interface (SPI), a value that can be
assigned to a return token, or to the last field of an error token, to identify an error that
occurred. SPI defines a small set of error numbers, but most error numbers are defined
by subsystems.
ESS disk. A disk drive within an Enterprise Storage System (ESS).
Event Management Service (EMS). A Distributed Systems Management (DSM) product
that provides event collection, event logging, and event distribution facilities. EMS
provides different event descriptions for interactive and programmatic interfaces, lets
an operator or an application select specific event-message data, and allows for
flexible distribution of event messages within a system or network.
event message. Text intended for a system operator that describes a change in some
condition in the system or network, whether minor or serious. The change of condition
is called an event. Events can be operational errors, notifications of limits exceeded,
requests for actions needed, and so on. See also operator message
.
extent. A contiguous area on disk for allocating one file.
fabric. A complex set of interconnections through which there can be multiple and (to the
user) unknown paths from point to point. The term fabric is used to refer to the X or Y
portion of the internal or external network; for example, the X fabric.
fault tolerance. The ability of a HP NonStop S-series system to continue processing
despite the failure of any single software or hardware component within the system.
FC switch. See Fibre Channel switch (FC switch)
.
Fibre Channel ServerNet adapter (FCSA). A ServerNet adapter that transmits data
between an HP NonStop™ server and Fibre Channel storage devices. This ServerNet
adapter is installed in an IOAM enclosure.