NonStop S-Series System Expansion and Reduction Guide

Glossary
G-Series Common Glossary
Glossary-30
endian
endian. Denotes the significance of byte 0 in a multibyte structure such as a word. NonStop
servers are big-endian, where the most significant bit is contained in byte 0. Intel
systems and HP AlphaServer OpenVMS and HP AlphaServer Tru64 UNIX systems
are little-endian, where the least significant bit is contained in byte 0.
environmental parameters. Subsystem Control Facility (SCF) session parameters set by
default or by using various SCF commands. The values associated with the
environmental parameters can be examined using the ENV command.
environment strings. For an Open System Services (OSS) process, a vector of strings of
the form
name = value that contains information about the environment that the
process runs in. Environment strings are accessible to the process and are inherited by
its child processes.
Enterprise Storage System (ESS). A collection of magnetic disks, their controllers, and the
disk cache in a stand-alone 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.
EPO. See emergency power off (EPO).
Epoch. The period beginning January 1, 1970, at 0 hours, 0 minutes, and 0 seconds
Coordinated Universal Time (UTC)
.
EPO connector. See emergency power-off (EPO) connector.
equipment grounding conductor. The conductor used to connect the non-current-carrying
metal parts of equipment, raceways, and other enclosures to the grounding electrode
conductor at the facility’s main service entrance or at the source of a separately
derived power source.
errno. An external variable that contains the most recent error condition set by a C function.
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.
ESD kit. See electrostatic discharge (ESD) protection kit.
ESP. See expansion service processor (ESP).
ESS. See Enterprise Storage System (ESS).
essential firmware. Code in memory that is necessary for power-up initialization and
communication with a host or device. Contrast with nonessential firmware
.