1. <hardware, storage> Writing duplicate data to more than one device (usually two hard disks), in order to protect against loss of data in the event of device failure. This technique may be implemented in either hardware (sharing a disk controller and cables) or in software. It is a common feature of RAID systems.

Several operating systems support software disk mirroring or disk-duplexing, e.g. Novell NetWare.

See also: Redundant Array of Independent Disks.

Interestingly, when this technique is used with magnetic tape storage systems, it is usually called "twinning".

A less expensive alternative, which only limits the amount of data loss, is to make regular backups from a single disk to magnetic tape.

2. mirror site.

(01 Apr 1998)

Mirizzi, P, Mirizzi's syndrome, mirnov oscillations < Prev | Next > mirror, mirror effect

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1. A looking-glass or a speculum; any glass or polished substance that forms images by the reflection of rays of light. "And in her hand she held a mirror bright, Wherein her face she often viewed fair." (Spenser)

2. That which gives a true representation, or in which a true image may be seen; hence, a pattern; an exemplar. "She is mirour of all courtesy." (Chaucer) "O goddess, heavenly bright, Mirror of grace and majesty divine." (Spenser)

3. <zoology> See Speculum.

<zoology> Mirror carp, a domesticated variety of the carp, having only three or fur rows of very large scales side. Mirror plate. A flat glass mirror without a frame. Flat glass used for making mirrors. Mirror writing, a manner or form of backward writing, making manuscript resembling in slant and order of letters the reflection of ordinary writing in a mirror. The substitution of this manner of writing for the common manner is a symptom of some kinds of nervous disease.

Origin: OE. Mirour, F. Miroir, OF. Also mireor, fr. (assumed) LL. Miratorium, fr. Mirare to look at, L. Mirari to wonder. See Marvel, and cf. Miracle, Mirador.

(01 Mar 1998)