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96257 Sun Confidential: Internal Only C-91
Revision A
Fibre Channel (FC). An ANSI-standard serial interface
used to provide high-speed data transfers between work-
stations, servers, desktop computers, peripherals and,
more recently, as a channel for attachment of storage
devices. FC allows concurrent communication between
connected elements. FC topologies include Fibre Chan-
nel-Arbitrated Loop (FC-AL), point-to-point, and switched
fabric.
FICON. FIbre CONnection. An IBM S/390-based chan-
nel architecture that provides up to 256 channels in a
single connection, each having a capacity of 100 MB per
second.
file. A set of related records treated as a unit.
fixed-block architecture (FBA) device. A disk storage
device that stores data in blocks of fixed size; these
blocks are addressed by block number relative to the be-
ginning of the particular file. Contrast with count-key data
device.
fixed mapping. A mapping technique where the location
of a mapped object is a fixed, computable function of the
identity of the mapped object and a description of the
mapping scheme. See also mapping
. Contrast with dy-
namic mapping.
foreground. A mode of operation where tasks are per-
formed on a high-priority basis as soon as possible, de-
pending on available resources. Contrast with back-
ground.
F_Port. Fabric port. Also written as F_PORT
.
FLOGIN. Fabric login.
FL_Port. Fabric port with loop capability.
free space. Back-end disk array storage space that does
not contain user data.
free space collection. In VSM, an automatic back-
ground task that relocates data from fragmented VTSS
disk cylinders and collects the resulting free space into
empty cylinders, making write operations more efficient.
free space directory. In VSM, an internal microcode
structure that contains the free space list and free cylin-
der list.
front end. The portion of a VTSS controller data path
that passes data between channels and cache.
FRU. Field-replaceable unit. The smallest self-contained
part or component in a system that can be individually
replaced during a service or repair action.
FSC. See Fault Symptom Code
.
FTD. See Functional Track Directory
.
FTR. See Functional Track Recovery
.
full-duplex. A communications channel that transmits
data in both directions at once. Contrast with half-duplex.
functional. In VTSS, a view or description of stored data
encompassing physical and/or logical elements. Con-
trast with logical
, physical.
functional allocated space. A user-allocated portion of
functional volume space; i.e., datasets as defined in a
VTOC, or minidisks as defined in a VM directory.
functional capacity. The amount of data that can be
stored on a VTSS, as viewed by a host.
functional device. See functional volume
.
functional device identifier (FDID). A unique numeric
identifier (an integer from 1 to 1023) for a functional vol-
ume image as known to a VTSS.
functional device ID mapping. The correlation between
the FDID and the host system identification for a specific
functional volume image. See also mapping
.
functional free space. The unallocated and/or unused
portion of the space on a functional volume as defined in
the VTOC or VM directory.
functional stored space. The used portion of functional
allocated space for a specific functional volume.
functional-to-logical mapping. The relationship be-
tween functional devices and logical devices. See map-
ping. See also fixed mapping, dynamic mapping.
functional track record. A record stored on contiguous
sectors in an allocated array cylinder.
Functional Track Directory (FTD). A VTSS internal
mapping table that contains one entry for each functional
track associated with the functional volumes currently
defined by the user.
functional track recovery (FTR). In VSM, an automatic
process of recovering data from a physical track in a
VTSS disk drive that is unreadable due to a media defect
or failed device, accomplished by reading and process-
ing data and redundancy information at corresponding
physical track locations on remaining devices in an array.
functional volume. A logical object in a data storage
pool that is used to store data; a data carrier that is
mounted or demounted as a unit; a volume image that a
host system receives when the ‘read device characteris-
tics’ channel command word is issued.
G
GA. General Availability. A Sun StorageTek term indicat-
ing a date after which a product is generally available to
all customers.
Gb. Gigabit. A unit of data capacity equal to one billion
(1,000,000,000 or 10
9
) bits. One gigabit is equal to one
thousand megabits or one million kilobits. Also abbreviat-
ed gbit or Gbit. Contrast with bit, kilobit, megabit.
GB. Gigabyte. A unit of data capacity roughly equal to
one billion (1,000,000,000 or 10
9
) bytes. One gigabyte is
equal to one thousand megabytes or one million kilo-
bytes. Also abbreviated as gbyte, Gbyte. Contrast with
byte, kilobyte, megabyte, petabyte, terabyte.
Gbps. Gigabits per second (billion bits per second).
GBps. Gigabytes per second (billion bytes per second).
GFI. Guided Fault Isolation.
GFR. Guided FRU Replacement. A utility in the VTSS
support facility that defines and coordinates FRU re-
placement, and manages FRU isolation and FRU swaps.
ground. A conducting connection, whether intentional or
accidental, between an electrical circuit or equipment
and the earth. The position or portion of an electrical cir-
cuit at zero potential with respect to the earth. A conduct-
ing connection to such a position or to the earth. A large
conducting body used as a return for electrical currents
and as an arbitrary zero of potential.
GUI. Graphical user interface. A generic name for any
computer interface that substitutes graphics for charac-
ters on a computer screen or console, and which usually
works with a navigational device such as a mouse or
trackball. Contrast with command line interface
.