NAS System
User Manual
11
1.3 RAID Levels
Below is the list of RAID Levels available for configuration in the NAS.
RAID
Level
No. of
Allowed
Failed
Drives
Description
Minimum
Required
Number
of Drives
0 None
Block striping is provided and yields higher
performance than with individual drives. There
is no redundancy.
1
1 1
Drives are mirrored. All data is 100%
duplicated on an equivalent drive. Fully
redundant.
2
5 1
Data is striped across several physical drives.
Parity protection is used for data redundancy.
3
6 2
Data is striped across several physical drives,
just like in RAID 5, and a second set of parity
is calculated and written across all the drives.
RAID 6 provides for an extremely high data
fault tolerance and can sustain multiple
simultaneous drive failures.
4
10 2
Striping over two RAID1 RAID sets. This level
provides mirroring and redundancy through
striping.
4
Linear
(JBOD)
None
Linear (JBOD) is similar to RAID 0 in that it
concatenates the capacity of all member
drives. The data is written linearly starting with
the first disk drive. When first disk drive
becomes full, the next disk drive is used.
Linear can have 1 or more disk drives. There is
no data redundancy.
1
