RAID 0, RAID 1, RAID 5, RAID 10 Explained with Diagrams-优快云博客

本文介绍了四种常见的RAID级别（RAID0、RAID1、RAID5和RAID10），并提供了易于理解的图表说明。RAID0提供优异性能但无冗余；RAID1通过磁盘镜像实现良好的冗余；RAID5使用分布式的奇偶校验块提供良好的性能和冗余；RAID10结合了RAID1和RAID0的优点，是最适合关键业务应用的选择。

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

On most situations you will be using one of the following four levels of RAIDs.

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

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

Following are the key points to remember for RAID level 10.

Minimum 4 disks.
Excellent performance ( as blocks are striped )
Excellent redundancy ( as blocks are mirrored )
If you can afford the dollar, this is the BEST option for any mission critical applications (especially databases).

注明：摘自http://www.thegeekstuff.com/2010/08/raid-levels-tutorial/