RAID 0+1 A RAID 0+1 is a striped array with segments consisting of RAID 0+1 arrays and having the same fault tolerance as RAID level 0+1 plus the overhead fault-tolerance of mirroring. RAID Level 0+1 (0+1) requires a minimum of 4 drives to configure. In some installations, a RAID 0+1 array can recover from multiple and simultaneous hard drive failures, however, a single drive failure will cause it to run as RAID 0. Because of the limited scalability and high inherent costs to operate, a RAID 0+1 is typically used for general application file servers. RAID0+1 is used as a high performance solution with reduced emphasis on reliability.
