System information

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Eclipse™ 2640 SAN Router Administration and Configuration Manual
Glossary
disk operating system DOS. The computer program that controls the organization of data,
files, and processes on the computer.
DNS name Domain name system or domain name service. Host or node name
for a device or managed product that is translated to an Internet
protocol (IP) address through a domain name server.
domain A Fibre Channel term describing the most significant byte in the node
port (N_Port) identifier for the Fibre Channel device. It is not used in
the Fibre Channel small computer system interface (FC-SCSI)
hardware path ID. It is required to be the same for all SCSI targets
logically connected to a Fibre Channel adapter.
domain ID Domain identifier. A number that uniquely identifies a switch in a
multiswitch fabric. A distinct domain ID is automatically allocated to
each switch in the fabric by the principal switch. The preferred
domain ID is the domain ID value that a switch requests from the
principal switch. If the value has not been allocated to another switch
in the fabric, it will be granted by the principal switch and will
become the requesting switch’s active domain ID. The active domain
ID is the domain ID that has been assigned by the principal switch
and that a switch is currently using.
domain name server In TCP/IP, a server program that supplies name-to-address
translation by mapping domain name to internet addresses. (D)
DOS See disk operating system.
DRAM See dynamic random access memory.
drop-down menu A menu that appears when a heading in a navigation bar is clicked on
with the mouse. The objects that appear in the drop-down menus are
organize by their headings in the navigation bar.
dump The file that is created when the director detects a software fault. It
contains various data fields that, when extracted, assist in the
debugging of software.
duplex In data communication, pertaining to transmission in which data is
sent and received at the same time (D). Contrast with
half duplex.
duplex connector An optical fiber component that terminates jumper cable fibers in one
housing and provides physical keying for attachment to a duplex
receptacle (D).