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Computing (FOLDOC) dictionary (also found in English - Vietnamese, English - English (Wordnet), )
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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 diskcontroller and cables) or in software. It is a common
feature of RAID systems.
Several operating systems support software disk mirroring or
Interestingly, when this technique is used with magnetictape 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
2. networking An archive site or web site which keeps a
copy of some or all files at another site so as to make them
more quickly available to local users and to reduce the load
on the source site. Such mirroring is usually done for
specific whole directories or files on a specific remote
server as opposed to a cache or proxy server which keeps
copies of everything that is requested via it.