RAID

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  • RAID 0 (striped disks) distributes data across several disks in a way that gives improved speed at any given instant. If one disk fails, however, all of the data on the array will be lost, as there is neither parity nor mirroring.
  • RAID 1 mirrors the contents of the disks, making a form of 1:1 ratio realtime backup. The contents of each disk in the array are identical to that of every other disk in the array.
  • RAID 5 (striped disks with parity) combines three or more disks in a way that protects data against loss of any one disk. The storage capacity of the array is reduced by one disk.
  • RAID 6 (striped disks with dual parity) (less common) can recover from the loss of two disks.
  • RAID 10 (or 1+0) uses both striping and mirroring. "01" or "0+1" is sometimes distinguished from "10" or "1+0": a striped set of mirrored subsets and a mirrored set of striped subsets are both valid, but distinct, configurations.
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