RAID 3

(redirected from RAID 4)

RAID 3

(Redundant Array of Independent Disks Mode 3) A disk or solid state drive (SSD) subsystem that increases safety by computing parity data and increasing speed by interleaving data across two or more drives (striping). RAID 3 achieves the highest data transfer rate because all drives operate in parallel. Using byte level striping, parity bits are stored on separate, dedicated drives. Somewhat similar, RAID 4 uses block level striping but is not as popular. See RAID parity, RAID 5, RAID 0 and RAID.


RAID 3 - Speed and Fault Tolerance
With data striped across two or more drives, RAID 3 achieves the highest data transfer rate because all drives operate in parallel.
References in periodicals archive ?
If this were a traditional RAID-4 volume, backing up to a virtual tape residing on this RAID 4 volume would cause a stripe of data to be written across all data members of the RAID 4 array, and parity would be written to the parity disk (see Figure).
Since RAID 5 is essentially a performance-enhanced variant of this RAID level, RAID 4 has been displaced in market.
Parity check blocks are distributed across all disks to prevent the parity disk in RAID 4 from becoming an I/O bottleneck.