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    RAID LEVEL 4: Independent Data Disks with Shared Parity Disk
    0 1 2 3 4 5 6 10 50 0+1
    RAID LEVEL 4: Independent Data Disks with Shared Parity Disk
    0 1 2 3 4 5 6 10 50 0+1

    Each entire block is written onto a data disk. Parity for same rank blocks is generated on Writes, recorded on the parity disk and checked on Reads.

    RAID Level 4 requires a minimum of 3 drives to implement 

    Featured Product

    Characteristics & Advantages

    • Very high Read data transaction rate
    • Low ratio of ECC (Parity) disks to data disks means high efficiency
    • High aggregate Read transfer rate

    Disadvantages

    • Quite complex controller design
    • Worst Write transaction rate and Write aggregate transfer rate
    • Difficult and inefficient data rebuild in the event of disk failure
    • Block Read transfer rate equal to that of a single disk
     
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