RAID stands for
Redundant Array of Inexpensive Disks. This is a solution where several physical
hard disks (two or more) are governed by a unit called RAID controller, which
turns them into a single, cohesive data storage block.
An example of a RAID
configuration would be to take two hard disks, each 80GB in size, and RAID them
into a single unit 160GB in size. Another example of RAID would be to take
these two disks and write data to each, creating two identical copies of
everything.
RAID controllers can be
implemented in hardware, which makes the RAID completely transparent to the
operating systems running on top of these disks, or it can be implemented in
software, which is the case we are interested in.
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