RAID Level 5

Data stored to the disk array is first divided into equal parts and stored onto each of the array’s disks. The data segment stored to any one disk is replicated, compressed, and stored onto another disk in the array. Thus, if any one disk fails, a compressed copy of its data is always available on the surviving disks.

This allows this RAID level to offer full data protection. It can also provide reasonable performance since data transfers are typically made
in parallel to all of the disks at the same time. Since redundant data is compressed before being stored on the other disks in the array, this RAID level offers more useable capacity than RAID level 1.

The equivalent capacity of one disk is consumed for overhead with this RAID level. For example, in a 4 drive array, the total useable capacity will be equivalent to 3 of its disks.

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