Answer Posted / venkatesh
RAID I, for example, writes two copies of the data
simultaneously on two separate drives. This is called fault
tolerant because if one of the mirrored drives suffers a
mechanical failure (e.g. spindle failure) or does not
respond, the remaining drive will continue to function. The
RAID 1 configuration is performed either by a hardware RAID
controller… or performed in software. It is suited to
applications requiring high fault tolerance at a low cost
and where a duplicated set of data is more secure than
using parity. RAID 1 is popular for accounting and other
financial data. It is also commonly used for small database
systems, enterprise servers, and home PCs where a fairly
inexpensive fault tolerance is required.
A RAID device maintains a mirror of all the data in a
partition... on another partition. This second partition is
usually on another drive (note: in Linux systems the second
partition can be on the same drive). There is a small
performance hit to be expected when configuring your hard
disks in a RAID 1 partition as the data has to be written
to every disk in the RAID array
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