Tuesday, April 18, 2017

RAID 0, RAID 1, RAID 5, RAID 10 Explained

RAID stands for Redundant Array of Inexpensive (Independent) Disks.

These are some of the RAIDs which are mostly used.
RAID 0
RAID 1
RAID 5
RAID 10


RAID 0 


  • Blocks are stripped
  • Excellent performance  (Blocks stripped)
  • No redundancy (No mirror no parity)
  • Cannot be used for critical system

RAID 1

  • Mirrored data to both drives
  • Minimum 2 disks
  • Good performance(No stripping no parity)
  • Excellent redundancy(blocks mirrored)



RAID 5

  • Minimum 3 disks.
  • Good performance ( as blocks are striped ).
  • Good redundancy ( distributed parity ).
  • Best cost effective option providing both performance and redundancy. Best for DB that is heavily read oriented. Write operations will be slow.

RAID 10

  • Minimum 4 disks.
  • This is also called as “stripe of mirrors”
  • Excellent redundancy ( as blocks are mirrored )
  • Excellent performance ( as blocks are striped )
  • If you can afford the dollar, this is the BEST option for any mission critical applications (especially databases).







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