RAID 1

• RAID 0 : data is “striped” across many disks similar to interleaved memory.

  • Not actually RAID.
  • No redundancy but high transfer rate due to organization.

• RAID 1 : redundancy is achieved by simple duplicating.

  • Read can be performed by either disk which ever has lower seek and rotational time.
  • Write can be performed simultaneous on the two disks.
  • Recovery from failures is simple: use the surviving disk.

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