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FICON
See fibre-channel connection.
FiconNet
In the DS Storage Manager, the label on a
pseudo host icon that represents a host
connection that uses the FICON protocol
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.
Glossary 335