EMC Symmetrix DMX-3 Product Guide
313
Glossary
F
fast write In the Symmetrix system, a write operation at global memory speed
that does not require immediate transfer of data to disk. The data is
written directly to global memory and is available for later destaging.
FBA Fixed Block Architecture. Disk drive data storage format using
fixed-size data blocks.
Fibre Channel A nominally 2 Gb/s serial data transfer interface technology,
although the specification allows data transfer rates from 133 Mb/s
up to 4.25 Gb/s. Data can be transmitted and received
simultaneously. Common transport protocols, such as Internet
Protocol (IP) and Small Computer Systems Interface (SCSI), run over
Fibre Channel. Consequently, a single connectivity technology can
support high-speed I/O and networking.
FC-AL Fibre Channel Arbitrated Loop. A standard for a shared access loop,
in which a number of Fibre Channel devices are connected (as
opposed to point-to-point transmissions). Requires a port to
successfully negotiate to establish a circuit between itself and another
port on the loop.
FC-SW Fibre Channel Switch Fabric. A Fibre Channel network standard
where nodes are connected to a fabric topology implemented by one
or more switches. Each node's N_Port connects to an F_Port on a
switch. Pairs of nodes connected to an FC-SW network can
communicate concurrently.
field replaceable unit
(FRU)
A component that is replaced or added by service personnel as a
single entity.
Frame Data packet format in an ESCON environment.
G
gigabyte (GB) 10
9
bytes. The GB
2
value is based on the convention:
1 GB = 1024 * 1024 * 1024 bytes.
The GB
10
value is based on the convention:
1 GB = 1000 * 1000 * 1000 bytes.
Although these values are expressed differently, their values are
equivalent
.
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