The downsides to RAID 5 are essentially the same as RAID 5 – the added parity doesn’t protect against data loss from a virus or human error. In exchange for this extra redundancy, RAID 6 does have slower write speeds than RAID 5, due to the extra parities that need to be calculated. Due to having double the amount of parity, RAID 6 is tolerant of up to two hard drive failures. For this reason, RAID 6 is frequently used in environments that have high data retention periods, like archives. RAID 6 arrays have double the amount of parity as RAID 5, offering very high fault-tolerance. RAID 6 is essentially RAID 5 but with added parity. For this reason, we see a lot of RAID 5 arrays in the data recovery lab. There is also a chance the data on the array could be lost in a malware infection or simply by human error. But RAID 5 isn’t a logical backup – if all drives in the array are damaged, the chances of seeing your data again are slim. RAID 5 offers the user increased speed as well as redundancy, due to the parity data. About one third of the drives’ storage capacity is taken up by the parity data. But it also stores parity information across them too, helping to rebuild the data in the event of a failure. Like RAID 0, RAID 5 stripes data across all drives in the array. RAID 5 requires at least three hard disk drives, but it isn’t unheard of to see arrays with as many as eight hard drives. Offering one drive of redundancy, RAID 5 is one of the most common RAID levels used. But that doesn’t mean RAID 6 is immune from failure. RAID 6 – or double parity – offers stronger safeguards against failure over RAID 5. RAID 5 offers one drive of redundancy in exchange for a small amount of drive storage.
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