IBM TOTAL STORAGE DS8000 User Manual
Page 349
consistency
group
interval
time
The
value
in
seconds
that
indicates
the
length
of
time
between
the
formation
of
consistency
groups.
consistent
copy
A
copy
of
a
data
entity
(a
logical
volume,
for
example)
that
contains
the
contents
of
the
entire
data
entity
at
a
single
instant
in
time.
console
A
user
interface
to
a
server,
for
example,
the
interface
provided
on
a
personal
computer.
See
also
IBM
TotalStorage
Management
Console.
contingent
allegiance
For
zSeries,
a
relationship
that
is
created
in
a
control
unit
between
a
device
and
a
channel
when
the
channel
accepts
unit-check
status.
The
allegiance
causes
the
control
unit
to
guarantee
access;
the
control
unit
does
not
present
the
busy
status
to
the
device.
The
allegiance
enables
the
channel
to
retrieve
sense
data
that
is
associated
with
the
unit-check
status
on
the
channel
path
associated
with
the
allegiance.
control
path
The
route
that
is
established
from
the
master
storage
unit
to
the
subordinate
storage
unit
when
more
than
one
storage
unit
participates
in
a
Global
Mirror
session.
If
there
is
only
one
storage
unit
(the
master)
in
the
Global
Mirror
session,
no
control
path
is
required.
control
unit
(CU)
1)
A
device
that
coordinates
and
controls
the
operation
of
one
or
more
input/output
devices,
and
synchronizes
the
operation
of
such
devices
with
the
operation
of
the
system
as
a
whole.
2)
For
zSeries,
a
storage
server
with
ESCON
or
OEMI
interfaces.
The
control
unit
adapts
a
native
device
interface
to
an
I/O
interface
that
a
zSeries
host
system
supports.
3)
The
portion
of
the
storage
unit
that
supports
the
attachment
of
emulated
count
key
data
devices
over
ESCON,
FICON,
or
OEMI
interfaces.
See
also
cluster.
control-unit
image
For
zSeries,
a
logical
subsystem
that
is
accessed
through
an
ESCON
I/O
interface.
One
or
more
control-unit
images
exist
in
each
control
unit.
Each
image
appears
as
an
independent
control
unit,
but
all
control-unit
images
share
a
common
set
of
hardware
facilities.
The
DS8000
can
emulate
3990-3,
TPF,
3990-6,
or
2105
control
units.
control-unit-initiated
reconfiguration
(CUIR)
A
software
mechanism
that
the
DS8000
uses
to
request
that
an
operating
system
of
a
zSeries
host
verify
that
one
or
more
subsystem
resources
can
be
taken
offline
for
service.
The
DS8000
can
use
this
process
to
automatically
vary
channel
paths
offline
and
online
to
facilitate
bay
service
or
concurrent
code
installation.
Depending
on
the
operating
system,
support
for
this
process
might
be
model
dependent,
might
depend
on
the
IBM
TotalStorage
Enterprise
Storage
Server
Subsystem
Device
Driver,
or
might
not
exist.
Coordinated
Universal
Time
(UTC)
The
international
standard
of
time
that
is
kept
by
atomic
clocks
around
the
world.
Copy
Services
A
collection
of
optional
software
features,
with
a
Web-browser
interface,
used
for
configuring,
managing,
and
monitoring
data-copy
functions.
Copy
Services
CLI
See
Copy
Services
command-line
interface.
Copy
Services
client
Software
that
runs
on
each
DS8000
cluster
in
the
Copy
Services
server
group
and
that
performs
the
following
functions:
v
Communicates
configuration,
status
and
connectivity
information
to
the
Copy
Services
server
v
Performs
data-copy
functions
on
behalf
of
the
Copy
Services
server
Copy
Services
command-line
interface
(Copy
Services
CLI)
The
command-line
interface
software
that
is
provided
with
DS8000
Copy
Services
and
used
for
invoking
Copy
Services
functions
from
host
systems
attached
to
the
DS8000.
See
also
command-line
interface.
Glossary
329