Difference between RAID 0, RAID 1, RAID 5 and RAID 10

RAID stands for Redundant Array of Inexpensive
(Independent) Disks.
In the most of the scenarios you will be using the
following raid configuration.
RAID 0
RAID 1
RAID 5
RAID 10 (also known as RAID 1+0)
This article explains the main difference between
these raid levels along with an easy to understand
diagram.
In all the diagrams mentioned below:
A, B, C, D, E and F – represents blocks
p1, p2, and p3 – represents parity
RAID LEVEL 0(zero)
Following are the key points to remember for RAID
level 0.
Minimum 2 disks.
Excellent performance ( as blocks are
striped ).
No redundancy ( no mirror, no parity ).
Don’t use this for any critical system.
RAID LEVEL 1
Following are the key points to remember for RAID
level 1.
Minimum 2 disks.
Good performance ( no striping. no parity ).
Excellent redundancy ( as blocks are
mirrored ).
RAID LEVEL 5
Following are the key points to remember for RAID
level 5.
Minimum 3 disks.
Good performance ( as blocks are striped ).
Good redundancy ( distributed parity ).
Best cost effective option providing both
performance and redundancy. Use this for DB
that is heavily read oriented. Write operations
will be slow.
RAID LEVEL 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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