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 RAID 3 - Bit-interleaved parity

RAID 3

RAID 3 uses an error correcting code (ECC) to protect against the loss of a single disk. Data is written in parallel in bytes to the data disks while parity is written to a dedicated disk. The disk spindles are synchronized (each byte of a stripe of data, and that data’s parity, occupies the same area on each disk) which increases throughput by minimizing disk head movement. When a data disk fails, the data from the dedicated parity disk is used to recreate the data to serve host requests and to rebuild the failed drive when replaced. If the parity disk should fail, the data disks are used to recreate parity and written to the replaced parity disk. With RAID 3, performance for small, random access of the data is slow since every I/O requires activity on every disk. RAID 3 is rarely used today since better performance and identical protection can be achieved with RAID level 5.

See other RAID arrays below:

 RAID 0 - Striped disk array
 RAID 1 - Mirroring and duplexing
 RAID 2 - Error-correcting coding
 RAID 3 - Bit-interleaved parity
 RAID 4 - Dedicated parity drive
 RAID 5 - Block interleaved distributed parity
 RAID 6 - Independent data disks with double parity
 RAID 7 - Adds caching to levels 3 or 4
 RAID 10 - High reliability combined with high data performance
 RAID 50 - High I/O rates and data transfer performance
 ZFS RAID - RAID type used by FreeNas and other units
 X-RAID - RAID type found in Netgear and other RAID units

For pricing information or questions about RAID 3 data recovery please call 1-888-307-3676.


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