Raid 0+1 - Onnto RS-M4QO User Manual

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 0
A1
A3
B1
B3
Disk 1
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.
RAID 0+1
RAID 1
A2
A4
B2
B4
Disk 2
24
RAID 0
A1
A3
B1
B3
Disk 3 Disk 4
A2
A4
B2
B4