Oyen Digital DATATALE RC-M4QJ 4-BAY RAID - Manual (Page 63)

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SPAN
Spanning provides another maximum capacity solution, which some call it as
“Large”. Spanning combines multiple hard drives into a single logical unit.
Unlike Striping, Spanning writes data to the first physical drive until it reaches full
capacity. When the first disk reaches full capacity, data is written to the second
physical disk. Spanning provides the maximum possible storage capacity, but
does not increase performance.
SPAN
Disk 1 Disk 2 Disk 3 Disk 4
A1
A2
A3
A4
B5
B6
B7
B8
C9
C10
C11
C12
D13
D14
D15
D16
CLONE
CLONE consists of at least two drives storing duplicate copies of the same data.
In this mode, the data is simultaneously written to two or more disks. Thus, the
storage capacity of the disk array is limited to the size of the smallest disk.
CLONE
Disk 1 Disk 2
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
Disk 3 Disk 4
The difference between Clone and RAID1 in our SMART RAID System is
that Clone can perform with more than 2 disks at a time, when Mirror can only
perform with 2 disks.