Raid Levels

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4 Terms

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RAID 0 - Striping

Data is spread across all drives in the array

  • Advantage: Better speed; all capacity used

  • Disadvantage: not fault tolerant

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RAID 1 - Mirroring

All data is duplicated to another drive or drives

  • Advantage: High read speeds from multiple drives; data available if a drive fails

  • Disadvantage: Uses twice the storage for the same amount of data

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RAID 5 - Striping with parity

Data is striped across drives, with one drive used for parity (checksum) of the data. Parity is spread across drives as well as data

  • Advantage: Data reads are fast; data writes are slightly slower. Drive failures can be rebuilt as long as only a single drive fails

  • Disadvantage: Can tolerate only a single drive failure at a time. Rebuilding arrays after a drive loss can be slow and impact performance

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RAID 10 - Mirroring and striping

Requires at least four drives, with drives added in pairs. Data is mirrored, then striped across drives.

  • Advantage: Combines the advantages and disadvantages of both RAID 0 and RAID 1

  • Disadvantage: Combines the advantages and disadvantages of both RAID 0 and RAID 1. Sometimes written as RAID 1+0