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PXE (Preboot Execution Environment): one of four components that together
make up the Wired for Management 2.0 baseline specification. PXE was
designed to define a standard set of preboot protocol services within a client
with the goal of allowing networked-based booting to boot using industry
standard protocols.
RAID (Redundant Array of Independent Disks): a way for the same data to
be stored in different places on many hard drives. By using this method, the
data is stored redundantly and multiple hard drives will appear as a single drive
to the operating system. RAID level 0 is known as striping, where data is striped
(or overlapped) across multiple hard drives, but offers no fault-tolerance. RAID
level 1 is known as mirroring, which stores the data within at least two hard
drives, but does not stripe. RAID level 1 also allows for faster access time and
fault-tolerance, since either hard drive can be read at the same time. RAID level
0+1 is both striping and mirroring, providing fault-tolerance, striping, and faster
access all at the same time.
RAIDIOS: RAID I/O Steering (Intel)
RAM (Random Access Memory): technically refers to a type of memory where
any byte can be accessed without touching the adjacent data and is often
referred to the system’s main memory. This memory is available to any program
running on the computer.
ROM (Read-Only Memory): a storage chip which contains the BIOS; the basic
instructions required to boot the computer and start up the operating system.
SDRAM (Synchronous Dynamic RAM): called as such because it can keep
two sets of memory addresses open simultaneously. By transferring data
alternately from one set of addresses and then the other, SDRAM cuts down on
the delays associated with non-synchronous RAM, which must close one
address bank before opening the next.
Serial port: called as such because it transmits the eight bits of a byte of data
along one wire, and receives data on another single wire (that is, the data is
transmitted in serial form, one bit after another).
SCSI Interrupt Steering Logic (SISL): Architecture that allows a RAID
controller, such as AcceleRAID 150, 200 or 250, to implement RAID on a
system board-embedded SCSI bus or a set of SCSI busses. SISL: SCSI
Interrupt Steering Logic ( LSI ) (only on LSI SCSI boards)
Sleep/Suspend mode: in this mode, all devices except the CPU shut down.