EC
See
engineering
change
.
ECKD
See
extended
count
key
data
.
eight
pack
See
disk
pack
.
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
(ESA/390)
An
IBM
architecture
for
mainframe
computers
and
peripherals.
Processor
systems
that
follow
the
ESA/390
architecture
include
the
ES/9000
®
family.
See
also
z/Architecture
.
Enterprise
Systems
Connection
(ESCON)
1)
A
zSeries
computer
peripheral
interface.
The
I/O
interface
uses
zSeries
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
.
ERP
See
error
recovery
procedure
.
error-recording
data
set
(ERDS)
On
zSeries
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
(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
A
zSeries
channel
that
supports
ESCON
protocols.
ESCON
director
(ESCD)
An
I/O
interface
switch
that
allows
the
interconnection
of
multiple
ESCON
interfaces
in
a
distributed-star
topology.
ESCON
host
systems
zSeries
hosts
that
attach
to
the
DS6000
with
an
ESCON
adapter.
Such
host
systems
run
on
operating
systems
that
include
MVS,
VSE,
TPF,
or
versions
of
VM.
ESCON
multiple
image
facility
(EMIF)
For
zSeries,
a
function
that
enables
LPARs
to
share
an
ESCON
channel
path
by
providing
each
LPAR
with
its
own
channel-subsystem
image.
EsconNet
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
DS6000.
See
also
pseudo
host
and
access-any
mode
.
ESD
See
electrostatic
discharge
.
eserver
See
IBM
e(logo)server
.
ESSNet
See
IBM
TotalStorage
Enterprise
Storage
Server
Network
.
express
configuration
A
method
for
configuring
a
storage
complex,
where
the
storage
server
Glossary
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