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# Raid Basics Explained - RAID 0, RAID 1, RAID 5, RAID 10

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This post will help you to understand the raid basics from scratch and explained raid with examples.

## RAID BASICS

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.

• 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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