and
that
is
not
completely
defined
on
the
DS8000.
See
also
pseudo
host
and
access-any
mode
.
field
replaceable
unit
(FRU)
An
assembly
that
is
replaced
in
its
entirety
when
any
one
of
its
components
fails.
In
some
cases,
a
field
replaceable
unit
might
contain
other
field
replaceable
units.
(GC)
FIFO
See
first-in-first-out
.
File
Transfer
Protocol
(FTP)
In
TCP/IP,
an
application
protocol
used
to
transfer
files
to
and
from
host
computers.
See
also
Transmission
Control
Protocol/Internet
Protocol
.
firewall
A
protection
against
unauthorized
connection
to
a
computer
or
a
data
storage
system.
The
protection
is
usually
in
the
form
of
software
on
a
gateway
server
that
grants
access
to
users
who
meet
authorization
criteria.
first-in-first-out
(FIFO)
A
queuing
technique
in
which
the
next
item
to
be
retrieved
is
the
item
that
has
been
in
the
queue
for
the
longest
time.
(A)
fixed-block
architecture
(FBA)
An
architecture
for
logical
devices
that
specifies
the
format
of
and
access
mechanisms
for
the
logical
data
units
on
the
device.
The
logical
data
unit
is
a
block.
All
blocks
on
the
device
are
the
same
size
(fixed
size).
The
subsystem
can
access
them
independently.
fixed-block
device
An
architecture
for
logical
devices
that
specifies
the
format
of
the
logical
data
units
on
the
device.
The
logical
data
unit
is
a
block.
All
blocks
on
the
device
are
the
same
size
(fixed
size);
the
subsystem
can
access
them
independently.
This
is
the
required
format
of
the
logical
data
units
for
host
systems
that
attach
with
a
SCSI
or
fibre-channel
interface.
See
also
fibre
channel
and
small
computer
systems
interface
.
FlashCopy
An
optional
feature
of
the
DS8000
that
can
make
an
instant
copy
of
data,
that
is,
a
point-in-time
copy
of
a
volume.
FlashCopy
relationship
A
mapping
of
a
FlashCopy
source
volume
and
a
FlashCopy
target
volume
that
allows
a
point-in-time
copy
of
the
source
volume
to
be
copied
to
the
target
volume.
FlashCopy
relationships
exist
from
the
time
that
you
initiate
a
FlashCopy
operation
until
the
storage
unit
copies
all
data
from
the
source
volume
to
the
target
volume
or
until
you
delete
the
FlashCopy
relationship,
if
it
is
persistent.
FRU
See
field
replaceable
unit
.
FTP
See
File
Transfer
Protocol
.
full
duplex
See
duplex
.
fuzzy
copy
A
function
of
the
Global
Copy
feature
wherein
modifications
to
the
primary
logical
volume
are
performed
on
the
secondary
logical
volume
at
a
later
time.
The
original
order
of
update
is
not
strictly
maintained.
See
also
Global
Copy
.
G
GB
See
gigabyte
.
GDPS
See
Geographically
Dispersed
Parallel
Sysplex
.
Geographically
Dispersed
Parallel
Sysplex
(GDPS)
A
zSeries
multisite
application-availability
solution.
gigabyte
(GB)
A
gigabyte
of
storage
is
10
9
bytes.
A
gigabyte
of
memory
is
2
30
bytes.
Global
Copy
An
optional
capability
of
the
DS8000
remote
mirror
and
copy
feature
that
maintains
a
fuzzy
copy
of
a
logical
volume
on
the
same
DS8000
or
on
another
DS8000.
In
other
words,
all
modifications
that
any
attached
host
performs
on
the
primary
logical
volume
are
also
performed
on
the
secondary
logical
volume
at
a
later
point
in
time.
The
original
order
of
update
is
not
strictly
maintained.
See
also
Remote
Mirror
and
Copy
and
Metro
Mirror
.
Global
Mirror
An
optional
capability
of
the
DS8000
remote
mirror
and
copy
feature
that
provides
a
2-site
extended
distance
remote
copy.
Data
that
is
written
by
the
host
to
the
storage
unit
at
the
local
site
is
Glossary
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