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ARCTICROC 4T – 4Bay RAID System - User Manual Page | 25

RAID 0+1

In the RAID 0+1 mode, data is organized as stripes across multiple disks. Then, the striped disk

sets are mirrored. It is usually called “a mirror of stripes.” RAID 0+1 mode provides excellent

data protection and fault tolerance. The speed of operation is fast in comparison to other RAID

modes (except RAID 0).

Under the RAID 0+1 Mode, 4 HDDs in an array are required. However, the storage

capacity is only 2 HDDs and is limited to size of the smallest HDD.

RAID 1

RAID 0+1

RAID 0 RAID 0

Disk 1 Disk 2 Disk 3 Disk 4

In RAID 0+1 mode, if any 2 of the 4 disks fail at the same time, the data can still be

reconstructed when they are replaced with new HDDs. However, if both failed disks

are in either HDD slots 2 & 3 or 1 & 4, the data will be lost.

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