Specifications

EMIF. See ESCON multiple image facility.
enclosure. A unit that houses the components of a
storage subsystem, such as a control unit, disk drives,
and power source.
end of file. A coded character recorded on a data
medium to indicate the end of the medium. On a CKD
direct access storage device, the subsystem indicates
the end of a file by including a record with a data length
of zero.
engineering change (EC). An update to a machine,
part, or program.
Enterprise Storage Server. See IBM TotalStorage
Enterprise Storage Server.
Enterprise Systems Architecture/390
®
(ESA/390) and
z/Architecture. IBM architectures for mainframe
computers and peripherals. Processor systems that
follow the ESA/390 architecture include the ES/9000
®
family, while the IBM Eserver zSeries server uses the
z/Architecture.
Enterprise Systems Connection (ESCON). (1) An
ESA/390 and zSeries computer peripheral interface.
The I/O interface uses ESA/390 logical protocols over a
serial interface that configures attached units to a
communication fabric. (2) A set of IBM products and
services that provide a dynamically connected
environment within an enterprise.
EPO. See emergency power off.
ERP. See error recovery procedure.
error recovery procedure (ERP). Procedures
designed to help isolate and, where possible, to recover
from errors in equipment. The procedures are often
used in conjunction with programs that record
information on machine malfunctions.
ESA/390. See Enterprise Systems Architecture/390.
ESCD. See ESCON director.
ESCON. See Enterprise System Connection.
ESCON channel. An S/390 or zSeries channel that
supports ESCON protocols.
ESCON director (ESCD). An I/O interface switch that
provides for the interconnection of multiple ESCON
interfaces in a distributed-star topology.
ESCON host systems. S/390 or zSeries hosts that
attach to the ESS with an ESCON adapter. Such host
systems run on MVS, VM, VSE, or TPF operating
systems.
ESCON multiple image facility (EMIF). In Enterprise
Systems Architecture/390, a function that enables
LPARs to share an ESCON channel path by providing
each LPAR with its own channel-subsystem image.
EsconNet. In ESS Specialist, the label on a
pseudo-host icon representing a host connection that
uses the ESCON protocol and that is not completely
defined on the ESS. See pseudo-host and access-any
mode.
ESD. See electrostatic discharge.
eserver. See IBM Eserver.
ESS. See IBM TotalStorage Enterprise Storage Server.
ESS Expert. See IBM StorWatch Enterprise Storage
Server Expert.
ESS Specialist. See IBM TotalStorage Enterprise
Storage Server Specialist.
ESS Copy Services. See IBM TotalStorage Enterprise
Storage Server Copy Services.
ESS Master Console. See IBM TotalStorage ESS
Master Console.
ESSNet. See IBM TotalStorage Enterprise Storage
Server Network.
Expert. See IBM StorWatch Enterprise Storage Server
Expert.
extended binary-coded decimal interchange code
(EBCDIC). A coding scheme developed by IBM used
to represent various alphabetic, numeric, and special
symbols with a coded character set of 256 eight-bit
codes.
extended count key data (ECKD). An extension of
the CKD architecture.
Extended Remote Copy (XRC). A function of a
storage server that assists a control program to
maintain a consistent copy of a logical volume on
another storage facility. All modifications of the primary
logical volume by any attached host are presented in
order to a single host. The host then makes these
modifications on the secondary logical volume.
extent. A continuous space on a disk that is occupied
by or reserved for a particular data set, data space, or
file. The unit of increment is a track. See multiple
allegiance and parallel access volumes.
F
F10. A model of the ESS featuring a single-phase
power supply. It has fewer expansion capabilities than
the Model F20.
F20. A model of the ESS featuring a three-phase
power supply. It has more expansion capabilities than
190 ESS Host Systems Attachment Guide
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