RAID Level 5 distributes the parity among the drives. This can speed small writes in multiprocessing systems, since the parity disk does not become a bottleneck. Because parity data must be skipped on each drive during reads, however, the performance for reads tends to be considerably lower. RAID Level 5 is n-1 meaning you lose the disk space of one drive in order to stripe data across the drives. A minimum of three drives is required for RAID5.

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