RAID is the technology of grouping several hard disk drives in a server
into an array that can be defined as a single logical drive.
This logical drive then appears to the operating system as a
single physical drive. This grouping technique greatly enhances
logical-drive capacity and performance. In addition, if one of the
hard-disk drives fails (becomes defunct) the system continues to
run, with no operator intervention required, at reduced performance.
The defective drive can be replaced without powering off the server (hot-swap ).
For more information about hot-swappable hard disk drives, see 'Installing Internal Drives'
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