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    Help Me Choose: RAID Configuration

    Level/Description Fault Tolerance Advantage Disadvantage
    RAID 0

    Maps data across the drives to create large virtual disks. Provides improved performance because each physical disk handles only part of the request. However, one drive failure makes the VD inaccessible and the data is lost permanently.
    None Improved performance
    Additional storage
    Should not be used for critical data
    RAID 1

    Mirrors data, where data is stored redundantly across two drives. If one disk fails, the other takes over and functions as the primary drive.
    Disk errors
    Single disk failures
    High read performance
    Fast recovery after drive failure
    Data redundancy
    High disk overhead
    Limited capacity
    RAID 5

    Maps data across drives and stores parity bits for each data stripe on different drives in the VD. Parity bits contain information that enables a disk’s data to be recreated from the remaining disks in the event of single disk failure.
    Disk errors
    Single disk failures
    Efficient use of drive capacity
    High read performance
    Med-to-High write performance
    Disk failure medium impact
    Longer rebuild due to parity recalculation
    RAID 6

    Maps data across drives and stores parity bits for each data stripe on different drives in the VD. Unlike RAID 5, RAID 6 makes two parity calculations — P & Q — enabling it to withstand dual disk failures.
    Disk errors
    Dual disk failures
    Data redundancy
    High read performance
    Write performance decrease due to dual parity calculations
    Extra cost due to 2 disk equivalent devoted to parity
    RAID 10

    Stripes over mirrored sets. High disk overhead, but excellent solution for those requiring high performance & redundancy plus the fastest recovery in the event of drive failure.
    Disk errors
    One disk failure per mirrored set
    High read performance
    Supports largest RAID group of 192 drives
    Most expensive
    RAID 50

    Stripes over RAID 5 sets. A performance increase over RAID 5 may be realized, depending on the configuration, due to fewer disk reads per parity calculation.
    Disk errors
    Single disk failure per span
    High read performance
    Med-to-High write performance
    Supports largest RAID group of 192 drives
    Disk failure medium impact
    Longer rebuild due to parity recalculation
    RAID 60

    Stripes over RAID 6 sets. A performance increase over RAID 6 may be realized, depending on the configuration, due to fewer disk reads per parity calculation.
    Disk errors
    Dual disk failure per span
    High read performance
    Supports largest RAID group of 192 drives
    Write performance decrease due to dual parity calculations
    Extra cost due to 2 disk equivalent devoted to parity
    
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