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    RAID LEVEL 1: Mirroring & Duplexing
    0 1 2 3 4 5 6 10 50 0+1
    RAID LEVEL 1: Mirroring & Duplexing
    0 1 2 3 4 5 6 10 50 0+1

    For Highest performance, the controller must be able to perform two concurrent separate Reads per mirrored pair or two duplicate Writes per mirrored pair.

    RAID Level 1 requires a minimum of 2 drives to implement

    Featured Product

    Characteristics & Advantages

    • One Write or two Reads possible per mirrored pair
    • Twice the Read transaction rate of single disks, same Write transaction rate as single disks
    • 100% redundancy of data means no rebuild is necessary in case of a disk failure, just a copy to the replacement disk 
    • Transfer rate per block is equal to that of a single disk
    • Under certain circumstances, RAID 1 can sustain multiple simultaneous drive failures
    • Simplest RAID storage subsystem design

    Disadvantages

    • Highest disk overhead of all RAID types (100%) - inefficient
    • Typically the RAID function is done by system software, loading the CPU/Server and possibly degrading throughput at high activity levels. Hardware implementation is strongly recommended
    • May not support hot swap of failed disk when implemented in "software"

    Recommended Applications

    • Accounting
    • Payroll
    • Financial
    • Any application requiring very high availability
     
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