POST — Power-on self-test. Before the operating system loads when you turn on your
system, the POST tests various system components such as RAM and hard drives.
processor — The primary computational chip inside the system that controls the
interpretation and execution of arithmetic and logic functions. Software written for
one processor must usually be revised to run on another processor. CPU is a synonym
PSU — Power supply unit.
PXE — Preboot eXecution Environment. A way of booting a system via a LAN
(without a hard drive or bootable media).
QPI — QuickPath Interconnect. The bus interface between the processors and
between the processors and the IOH chip.
RAID — Redundant array of independent disks. A method of providing data
redundancy. Some common implementations of RAID include RAID 0, RAID 1, RAID
5, RAID 10, RAID 50, and RAID 60. See also mirroring and striping.
RAM — Random-access memory. The system’s primary temporary storage area for
program instructions and data. Any information stored in RAM is lost when you turn
off your system.
RDIMM — A registered DDR3 memory module.
readme file — A text file, usually shipped with software or hardware, that contains
information supplementing or updating the product’s documentation.
read-only file — A read-only file is one that you are prohibited from editing or
ROM — Read-only memory. Your system contains some programs essential to its
operation in ROM code. A ROM chip retains its contents even after you turn off your
system. Examples of code in ROM include the program that initiates your system’s
boot routine and the POST.
ROMB — RAID on motherboard.
SAN — Storage Area Network. A network architecture that enables remote network-
attached storage devices to appear to a server to be locally attached.
SAS — Serial-attached SCSI.
SATA — Serial Advanced Technology Attachment. A standard interface between the
system board and storage devices.
SCSI — Small computer system interface. An I/O bus interface.
SD card — Secure digital flash memory card.
SDDC — Single device data correction.
SDRAM — Synchronous dynamic random-access memory.
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