APC iSCSI SATA II - Manual (Page 13)

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RAID Management
The subsystem can implement several different levels of RAID technology. RAID levels
supported by the subsystem are shown below.
RAID Level Description Min. Drives
0
Block striping is provide, which yields higher
performance than with individual drives. There is
no redundancy.
1
1
Drives are paired and mirrored. All data is 100%
duplicated on an equivalent drive. Fully
redundant.
2
N-way
mirror
Extension of RAID 1 level. It has N copies of the
disk.
N
3
Data is striped across several physical drives.
Parity protection is used for data redundancy.
3
5
Data is striped across several physical drives.
Parity protection is used for data redundancy.
3
6
Data is striped across several physical drives.
Parity protection is used for data redundancy.
Requires N+2 drives to implement because of
two-dimensional parity scheme
4
0 + 1
Mirroring of the two RAID 0 disk arrays. This
level provides striping and redundancy through
mirroring. 4
10
Striping over the two RAID 1 disk arrays. This
level provides mirroring and redundancy through
striping. 4
JBOD
The abbreviation of “Just a Bunch Of Disks”.
JBOD needs at least one hard drive.
1