Oyen Digital DATATALE RS-M4T 4-BAY THUNDERBOLT - Manual (Page 53)

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In Mirroring mode, if one of the hard drive/SSDs fails, either Source Disk or
Spare Disk, the data is still available. However, if the Source Disk fails during the
Rebuild process, the data in both hard drive/SSDs will be lost.
It is NOT recommended to do hot swap for the Source Disk during the
Rebuild process because it may cause the Rebuild process to fail and the data in
both hard drive/SSDs will be lost.
RAID 1+0
In RAID 1+0, the data is first mirrored and then striped. Under this RAID Mode, it
provides another way to achieve higher performance and data security, while
increasing complexity. The speed of operation is average in comparison to other
RAID modes.
Mirror
Striping
RAID 1+0
Disk 1 Disk 2
Mirror
Disk 3 Disk 4
RAID 1+0 requires a minimum of four (4) hard drive/SSDs in an array. If one
of the hard drive/SSDs becomes defective, the original and identical backed up
data is still available offhand.
JBOD (None RAID)
Just a Bunch of Disks (JBOD) refers to a group of hard drive/SSDs. In JBOD, the
number of logical hard drive/SSDs is equal to the number of physical hard
drive/SSDs. This mode allows the RAID System to operate as a multi-disk
storage enclosure, but provides no data redundancy. The speed of operation is
fast in comparison to other RAID modes.