McDATA Eclipse 2640 SAN, Administration And Configuration Manual

Page: 258 / 276

g-48 Eclipse™ 2640 SAN Router Administration and Configuration Manual
Glossary
pull-down menu See
drop-down menu .
PWA See
printed wiring assembly .
R
radio frequency
interference
RFI. Electromagnetic radiation which is emitted by electrical circuits
carrying rapidly changing signals, as a by-product of the normal
operation, and which causes unwanted signals (interference or noise)
to be induced in other circuits.
RAID See
redundant array of independent disks .
RAM See
random access memory .
random access
memory
RAM. A group of computer memory locations that is numerically
identified to allow high-speed access by the controlling
microprocessor. A memory location is randomly accessed by
referring to its numerical identifier
(D)
.
Contrast with
read-only
memory .
See
also dynamic random access memory ; nonvolatile
random access memory ; static random access memory .
R_A_TOV See
resource allocation time-out value .
read-only memory
ROM. An information storage chip with permanent memory. Stored
information cannot be changed or deleted except under special
circumstances
(D)
.
Contrast with
random access memory .
redundancy
Performance characteristic of a system or product whose integral
components are backed up by identical components to which
operations will automatically failover in the event of a component
failure. Redundancy is a vital characteristic of virtually all
high-availability (24 hours/7 days per week) computer systems and
networks.
redundant array of
independent disks
RAID. Grouping of hard drives in a single system to provide greater
performance and data integrity. RAID systems have features that
ensure data stored on the drives are safe and quickly retrievable.
remote notification
A process by which a system is able to inform remote users and
workstations of certain classes of events that occur on the system.
E-mail notification and the configuration of simple network