RAID 5, 1 can loose a hdd without loosing data.
3 - drives minimum
Disadvantages
- disk failure has an impact on performance.
Indepdendata data disk with distributed parity bit
Parity: A parity bit is a bit that is added to ensure that the number of bits with the value one in a set of bits is even or odd. Parity bits are used as the simplest form of error detecting code. (wiki)
http://www.sohoconsult.ch/raid/raid.html
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