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RAID 0+1
In the RAID 0+1 mode, data is organized as stripes across multiple disks. And
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 in RAID
0).
Under the RAID 0+1 mode, 4 HDDs in an array are required. However, the
storage capacity is only as 2 HDDs, which the total will be based on the smallest
size of the HDDs.
RAID 1
RAID 0+1
RAID 0
RAID 0
Disk 1
Disk 2
Disk 3
Disk 4
A1
A3
B1
B3
A2
A4
B2
B4
A1
A3
B1
B3
A2
A4
B2
B4
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.
Summary of Contents for DM4
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