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RAID 1

RAID0

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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