Ultra Start 450 SERIES Instruction Manual download pdf (Page 477)

Glossary 457

NVRAM Non-volatile random-access memory. A type of memory that retains

information when power is removed from the system.

parity A method used by a system for checking that data received matches data sent.

A parity error indicates that data was not received as it was transmitted.

partition The unit into which disk space is divided by software.

PCI Peripheral Component Interconnect. A high-performance input/output

interconnect for multimedia and graphics products, disk expansion, and high-

performance networking products.

physical address An address that corresponds to a hardware memory location. See also virtual

memory.

physical address

space The set of possible 41-bit physical addresses that refer to locations in memory

(memory space) or input/output space (device registers).

physical memory The main memory connected to the processor. See also secondary storage and

virtual memory.

POST Power-on self-test. A set of routines stored in a computer’s read-only memory

(ROM) that tests various system components such as RAM, the disk drives,

and the keyboard to see if they are properly connected and operating.

RAID Redundant array of inexpensive disks. A series of techniques to increase disk

throughput and availability.

RAID-5 An implementation of disk striping in which parity information is included

with each disk drive. If one RAID-5 array fails, all information can be

reconstructed from data and parity on the remaining disks.

See also metadevice.

RFI Radio frequency interference.

SCSI Small computer system interface. An industry-standard bus used to connect

disk and tape devices to a workstation.

secondary storage A device, such as a disk drive, used to back up the contents of main memory.

Also called auxiliary memory. See also physical memory and virtual memory.

swap partition A disk partition reserved for use by the operating system.

TCP Transmission control protocol. The major Internet transport protocol.

unmount The process of removing access to a directory on a disk attached to a machine

or a remote disk on a network. See also mount.

virtual memory A method of allowing a program access to more memory space than is

provided by physical memory through intelligently managing the transfer of

data between main memory and storage devices. See also physical memory and

secondary storage.

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Ultra Start 450 SERIES Instruction Manual Page 477