Oyen Digital DATATALE RS-M2QJ 2-BAY RAID - Manual (Page 38)

38
RAID 1 (Mirroring)
RAID 1 (Mirroring) consists of at least two drives storing duplicate copies of the
same data. In this mode, the data is simultaneously written to two disks. Thus,
the storage capacity of a two-disk array is combined into a single disk and the
capacity is limited to the size of the smallest disk.
RAID 1
Disk 1
Disk 2
A
B
C
D
A
B
C
D
In Mirroring mode, if one of the disks fails, either source or backup, the data
is still available. However, if the source disk fails during the Rebuild process, the
data in both disks will be lost.
The Rebuild feature is only available under RAID 1 mode, and it needs to
be set up/managed via RAID MASTER. Please read the "Rebuild" section in the
user's manual.
Span (Large)
Spanning provides another maximum capacity solution, which some call it as
“Large”. Spanning combines multiple hard drives into a single logical System.
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.