A more advanced version of RAID is RAID 10, which involves nesting RAID drives.

Build an array utilizing any RAID setup you want. Assuming the system can handle any type of array describe how you design a system with 4 x identical 1TB hard disks and the following requirements:

Performance is the ultimate goal

Data must be redundant in some manner (parity or mirroring); assume at least 2 drives may fail.

Total usable space is not as important as redundancy or performance