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Basics: What is RAID?

Hello,

A Simple readable format about "What is RAID?"

RAID (Redundant Array of Independent Disks). A collection of disk drives that offers increased performance and fault tolerance. There are a number of different RAID levels. The three most commonly used are 0, 1, and 5:

  • Level 0: striping without parity (spreading out blocks of each file across multiple disks).
  • Level 1: disk mirroring or duplexing.
  • Level 2: bit-level striping with parity
  • Level 3: byte-level striping with dedicated parity. Same as Level 0, but also reserves one dedicated disk for error correction data. It provides good performance and some level of fault tolerance.
  • Level 4: block-level striping with dedicated parity
  • Level 5: block-level striping with distributed parity
  • Level 6: block-level striping with two sets of distributed parity for extra fault tolerance
  • Level 7: Asynchronous, cached striping with dedicated parity

Hope this helps!!!!

September 24th, 2012 | Category: Storage

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