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.
While RAID 5 eliminates the need for a single "hot" parity drive
, it is difficult to administer and scale.
Unlimited RAID PARITY configurations yielding any desired level of parity drives
, yielding user specific tolerance to simultaneous HDD failures