RAID6 Advantages

RAID6 systems instead of storing only one parity and error correction information store two, which are arranged in such a way that even if one of the hard disk drives fails during the data recovery process, the systems continues operational, with no data loss.

In Figure 2, you can see the probability of data loss during a data recovery procedure on RAID0 (in blue), RAID5 (in yellow the probability of hard disk drive failure and in pink the probability of a system failure) and RAID6 (in light blue).

RAID6Figure 2: RAID0, RAID5 and RAID6 comparison.

The “y” axis shows the number of months until a unrecoverable failure while the “x” axis shows the system capacity, in GB.

As you can see on the graph, RAID6 only has the same failure probability of RAID5 on systems starting at 23 TB, below this point RAID6 presents a failure probability far lower than RAID5, being the recommended system for storage systems where reliability is the key word.

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.