RAID 3 is a RAID configuration consists of byte-level striping with a dedicated parity disk to cache the information produced by a RAID controller instead of striping it with the data.
Since RAID 3 uses separate parity disk to store information, it doesn’t perform well when tasked with various small data requests. RAID 3 is suitable for applications having long sequential data transfer, such as – streaming media, graphics and video editing.
However, RAID 3 array is rarely used in practice, it has some noteworthy advantages. First, it is resistant to damage of one disk in the arrangement. Second advantage of using RAID 3 is its high read speed.
Some disadvantages of RAID 3 are – First, the configuration may be too much if you need to transfer a small file. Second, throughput can be adversely affected in the event of the disk failures.