Dell PRECISION 530 - Manual (Page 296)

296 Glossar y
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• The client computer can be remotely shut down and
restarted.
• Since PXE is an industry standard, new computers
can easily be added to the network.
RAID
Redundant Array of Independent Disks. A system of
two or more drives working together for performance
and fault tolerance. RAID drives are typically used on
servers and high-end PCs .
There are a number of different RAID levels. The
three most common are 0, 3, and 5:
• Level 0: Provides data striping but no redundancy.
This improves performance but does not provide
fault tolerance.
• Level 3: Same as Level 0, but also reserves one
dedicated drive for error correction data, providing
good performance and some level of fault tolerance.
• Level 5: Provides data striping at the byte level and
also stripe error correction information. This results
in excellent performance and good fault tolerance.
RAM
Random-access memory. The primary temporary
storage area for program instructions and data. RAM
is stored in chips on small circuit boards called
SIMMs , DIMMs , or RIMMs , that attach to the
system board. RAM, unlike ROM , is volatile, which
means that, when you turn off your computer, any
information stored in RAM is lost.
Rambus
Rambus is a memory technology that is designed to
work with existing system board standards as an
alternative to DRAM . See also RIMM , RDRAM , and
DRDRAM .
RDRAM
Rambus dynamic random-access memory ( DRAM ). A
memory subsystem that can optimally transfer up to
1.6 billion bytes of data per second. The subsystem
consists of RAM , the RAM controller, and the bus
connecting RAM to the microprocessor and other
devices in the computer. See also DRDRAM .
Remote Wake Up
A standard of WfM that provides the ability either to
remotely wake a computer from a low-power sleep
state or to remotely start a computer that is turned
off but connected to a power source. Remote Wake
Up, typically used to conserve power in large network
organizations and to remotely perform
maintenance/configuration operations, must be
supported by an ACPI -compatible computer.
Additionally, to start by a network connection, the
network adapter must support WOL . To start by a
telephone connection, the modem must support
WOR .
RIMM
Rambus in-line memory module. A slim circuit board
containing RDRAM chips . RIMMs are plugged into
sockets on the computer's system board to add
memory to the computer. They typically must be
installed in matched pairs, meaning two sockets
forming a pair must contain RIMMs of identical
capacity, number of RDRAM chips, and speed. See
also SIMM and DIMM .
RJ45
A form of connector resembling a standard telephone
jack that is typically used to connect Ethernet and
Token Ring network adapters and cables. Unlike a
telephone jack, an RJ45 connector has eight wires
instead of two, four, or six.
ROM
Read-only memory. Memory that stores data and
programs that cannot be deleted or written to by the
computer. ROM, unlike RAM , retains its contents
even after you turn off your computer. Some
programs essential to the operation of your computer
reside in ROM.