PXE (Pre boot 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, towards 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,
also the 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, is often used to refer 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.
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
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.
SRAM (Static RAM): unlike DRAM, this type of RAM does not need to be refreshed in
order to prevent data loss. Thus, it is faster and more expensive.
Serial ATA: Often abbreviated SATA or S ATA, an evolution of the Parallel ATA physical
storage interface. Serial ATA is a serial link a single cable with a minimum of four wires
creates a point to point connection between devices. Transfer rates for Serial ATA begin
at 150MBps. One of the main design advantages of Serial ATA is that the thinner serial
cables facilitate more efficient airflow inside a form factor and also allow for smaller
chassis designs. In contrast, IDE cables used in parallel ATA systems are bulkier than
Serial ATA cables and can only extend to 40cm long, while Serial ATA cables can extend
up to one meter.
Serial port: Called such because it transmits the eight bits of a byte of data along one
wire, and receives data on another single wire (the data is transmitted in serial form, one
bit after another).