What is RAID ? Different types of RAID

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What is RAID

RAID stands for Redundant Array of Inexpensive Disks. It basically means using multiple drives/disk to achieve better performance or better reliability.

Different types of RAID


Excellent performance, No redundancy (No mirror)

It involves taking two drives or more and striping the data across all of the drives.

  • Double read/write performance.
  • If one of the drives goes hardware failure you will loose all of the data.


Excellent redundancy, unaffected performance

It involves taking two drives or more and storing the same data in each drive.

  • If one of the drive fails then data will not loose.
  • You will get only half of the capacity.


It combines RAID 0 and RAID 1

Excellent performance, Excellent redundancy

It involves taking four drives and striping the data into two drives and other two drives for mirroring those drives.

There are other many types of RAID exists like RAID 3, RAID 4, RAID 5, RAID 6.