RAID6
RAID6 double parity technology, technical RAID5 adds a second independent parity block, the parity two separate systems using different algorithms so that the data reliability is very high.
Advantages: even if two disks fail at the same time will not affect the use of data to further strengthen the protection of data; data reliability.
Cons: Write performance is poor; disk utilization is low.
Composition conditions: the same size of the disk at least four. 
To create a raid6 raid5 is actually very similar to, but because it is the principle of the number of disks required will be more than raid5 piece created before raid6 we need to add them in and its partition with the file system type of modification.
The next step is that we create in the raid6.
After creating raid6 we also need to create a verification result.
After raid6 created us to be formatted and mounted it can really be used.