# RAID

### RAID Definition <a href="#metalcloudraid-raiddefinition" id="metalcloudraid-raiddefinition"></a>

A Redundant Array of Independent Disks (RAID) is a method of configuring member drives to create high availability and high performance systems. The RAID level provides different degrees of redundancy and performance; it also determines the number of members in the array

### RAID level <a href="#metalcloudraid-raidlevel" id="metalcloudraid-raidlevel"></a>

The RAID level is what determines the relationship of the disks.

|        |                                                                                                                                                                                                                           |       |                           |      |
| ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----- | ------------------------- | ---- |
| RAID 0 | <p>RAID 0 combines two or more disks by stripping data across them.</p><p>That chunks of data are written to each disk in the array alternately.</p>                                                                      | 1 - 8 | Drive count \* Drive size | None |
| RAID 1 | <p>RAID 1 is a configuration that mirrors data between two or more disks.</p><p>Everything written to the array is placed on each of the devices in the group, so each disk has a complete set of the available data.</p> | 2     | Drive size                | 1    |

\*Redundancy means how many drive failures the array can tolerate. In some circumstances, an array can tolerate more than 1 drive failure.


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