RAID-1 requires atleast 2 drives to implement.One writes or two Reads possible per mirrored pair

1)Doubled the Reading transaction rate of single disks, same Write transaction rate as single disks.

2)complete 100% redundancy of data means no rebuild is necessary in case of a disk failure, just a copy to the replacement disk.

3)Transfer rate per block is equal to that of a single disk

4) Under certain circumstances, RAID-1 can sustain multiple simultaneous drive failures.

5) Simplest RAID storage subsystem design.

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