RAID 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
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

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"
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