Dell D03T Manuale - Pagina 7

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RAID 5

RAID 5 provides better performance by using data striping and protection through parity. The disadvantage of RAID 5 is that

rebuilding a large RAID 5 volume requires a longer period of time.

The following are the key features of RAID 5:

● Requires at least three drives.

● Data is available even if one of the drives present in the volume fails. The failed drive must be replaced, and the volume must

be rebuilt for the data to be accessible.

● The total capacity is N-1, where N is the total capacity of the drives in the array. For example, if you use three 1 TB drives in

a RAID 5 array, the total volume size is 2 TB.

The following figure shows that if one 2 TB drive fails, data is lost. However, if there are three 1 TB drives in a RAID 5 array, the

data is still available even if one of the drives fails.

Introduction