User`s manual

34
In Striping mode, if one disk in the RAID Unit fails, all data in installed disks
will be lost.
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 Old disk fails during the Rebuild process, the
data in both disks will be lost.
SPAN (LARGE)
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.