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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. RAID 0+1 is used as a high performance solution with reduced emphasis on reliability.
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