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Unlike conventional backup operations where a failed drive or cartridge can cripple data backup or recovery operations, parity information stored on a parity drive is used to recover data if a tape containing data cannot be read.
But when the same system was backed up with an Ultera Striper(TM) array controller using two AIT drives plus a parity drive, throughput did not double as expected, but more than tripled compared with the stand-alone drive, said Bostick.
Unlimited RAID PARITY configurations yielding any desired level of parity drives, yielding user specific tolerance to simultaneous HDD failures