IBM DS8000 User Manual page 221

electrostatic discharge (ESD)
An undesirable discharge of static
electricity that can damage equipment
and degrade electrical circuitry.
emergency power off (EPO)
A means of turning off power during an
emergency, usually a switch.
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 count-key-data 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 Systems Architecture/390
An IBM architecture for mainframe
computers and peripherals. Processor
systems that follow the ESA/390
architecture include the ES/9000
See also z/Architecture.
Enterprise Systems Connection (ESCON)
1) A System z computer peripheral
interface. The I/O interface uses System z
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.
ERDS See error-recording data set.
error-recording data set (ERDS)
On System z hosts, a data set that records
data-storage and data-retrieval errors. A
service information message (SIM)
provides the error information for the
ERDS.
error recovery procedure
Procedures designed to help isolate and,
where possible, to recover from errors in
equipment. The procedures are often used
ESA/390
ESCD See ESCON director.
ESCON
ESCON channel
ESCON director (ESCD)
ESCON host systems
ESCON multiple image facility (EMIF)
®
(ESA/390)
®
family. EsconNet
ESD
eServer
ESSNet
extended count key data (ECKD)
extent A continuous space on a disk that is
extent pool
in conjunction with programs that record
information on machine malfunctions.
See Enterprise Systems Architecture/390.
See Enterprise System Connection.
A System z channel that supports ESCON
protocols.
An I/O interface switch that allows the
interconnection of multiple ESCON
interfaces in a distributed-star topology.
System z hosts that attach to the DS8000
series with an ESCON adapter. Such host
systems run on operating systems that
include MVS, VSE, TPF, or versions of
VM.
For System z, a function that enables
LPARs to share an ESCON channel path
by providing each LPAR with its own
channel-subsystem image.
In the DS Storage Manager, the label on a
pseudo host icon that represents a host
connection that uses the ESCON protocol
and that is not completely defined on the
DS8000. See also pseudo host and access-any
mode.
See electrostatic discharge.
™
See IBM eServer.
See IBM TotalStorage Enterprise Storage
Server Network.
An extension of the count key data (CKD)
architecture.
occupied by or reserved for a particular
data set, data space, or file. The unit of
increment is a track. See also multiple
allegiance and parallel access volumes.
A groups of extents. See also extent.
193
Glossary