RAID level-5 stripes data and parity across all drives in the array.
RAID level-5 offers both data protection and increased throughput. When you assign RAID level-5 to an array, the capacity of the array is reduced by the capacity of one drive (for data-parity storage). RAID level-5 gives you higher capacity than RAID level-1, but RAID level-1 offers better performance.
RAID level-5 requires a minimum of three drives and, depending upon the level of firmware and the stripe-unit size, supports a maximum of 8 or 16 drives.
The following illustration is an example of a RAID level-5 logical drive.
|Start with four physical drives.|
|Create an array using three of the physical drives, leaving the fourth as a hot-spare drive.|
|Then create a logical drive within that array.|
|The data is striped across the drives,
Notice that the storage of the data parity (denoted by *) also is striped, and it shifts from drive to drive.
A parity block (*) contains a representation of the data from the other blocks in the same stripe. For example, the parity block in the first stripe contains data representation of blocks 1 and 2.
| If a physical drive fails in the
array, the data from the failed physical drive is reconstructed onto the
RAID level-5 offers the following advantages and disadvantages.
||Lower performance than RAID level-1 and level-1E|