Proware 3164S1/D1-G1S3, User Manual

Page: 15 / 162

iSCSI GbE to SAS/SATA II RAID Subsystem
User Manual 15
1.3 RAID Levels
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 to 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
30
Combination of RAID levels 0 and 3. This level is
best implemented on two RAID 3 disk arrays
with data striped across both disk arrays.
6
50
RAID 50 provides the features of both RAID 0
and RAID 5. RAID 50 includes both parity and
disk striping across multiple drives. RAID 50 is
best implemented on two RAID 5 disk arrays
with data striped across both disk arrays.
6
60
RAID 60 provides the features of both RAID 0
and RAID 6. RAID 60 includes both parity and
disk striping across multiple drives. RAID 60 is
best implemented on two RAID 6 disk arrays
with data striped across both disk arrays.
8
JBOD
The abbreviation of “Just a Bunch Of Disks”.
JBOD needs at least one hard drive.
1