IBM DS8000 User Manual page 223

Fibre Channel Switched Fabric (FC-SF)
An implementation of the Fibre Channel
Standard that connects the storage unit to
one or more open systems hosts through
a fabric switch or connects one or more
S/390 hosts that run LINUX on an Fibre
Channel Protocol S/390 channel.
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 series. 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 series
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.
FlashCopy SE
An optional feature of the DS8000 series
that allocates storage space on an
"as-needed" basis and uses only the
required number of tracks to write
changed data during the lifetime of the
FlashCopy relationship.
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 System z multisite
application-availability solution.
195
Glossary