Compaq HSZ80 manual GL-4Glossary, Data striping

GL–4Glossary
data striping	The process of segmenting logically sequential data, such as a single file, so
	that segments can be written to multiple physical devices (usually disk
	drives) in a round-robin fashion. This technique is useful if the processor is
	capable of reading or writing data faster than a single disk can supply or
	accept the data. While data is being transferred from the first disk, the
	second disk can locate the next segment.
device	See node and peripheral device.
differential I/O	A 16-bit I/O module with SCSI bus converter circuitry for extending a
module	differential SCSI bus. See also I/O module.

differential SCSI busA bus in which a signal’s level is determined by the potential difference between two wires. A differential bus is more robust and less subject to electrical noise than is a single-ended bus.

DIMM	Dual Inline Memory Module.
dirty data	Write-back cached data that has not been written to storage media, even
	though the host operation processing the data has completed.
disaster tolerance	The ability to resume data center operations shortly after a significant event
	occurs at the primary data center. The ability to restart processing can require
	an alternate data center, with current copies of critical data in a usable state.
DMA	Direct Memory Access.
driver	A hardware device or a program that controls or regulates another device.
	For example, a device driver is a driver developed for a specific device that
	allows a computer to operate with the device, such as a printer or a disk
	drive.
dual-redundant	A controller configuration consisting of two active controllers operating as a
configuration	single controller. If one controller fails, the other controller assumes control
	of the failing controller’s devices.