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

1

 

 

no redundancy.

 

 

 

 

 

 

 

 

1

Drives are paired and mirrored. All data is 100%

 

 

 

duplicated on an equivalent drive. Fully

2

 

 

redundant.

 

 

 

 

 

 

 

 

N-way

Extension of RAID 1 level. It has N copies of the

 

N

mirror

disk.

 

 

 

 

 

 

 

 

 

3

Data is striped across several physical drives.

3

 

Parity protection is used for data redundancy.

 

 

 

 

 

 

 

 

 

 

5

Data is striped across several physical drives.

3

 

Parity protection is used for data redundancy.

 

 

 

 

 

 

 

 

 

 

 

Data is striped across several physical drives.

 

 

 

6

Parity protection is used for data redundancy.

4

 

Requires N+2 drives to implement because of

 

 

 

 

 

 

two-dimensional parity scheme

 

 

 

 

 

 

 

 

 

Mirroring of the two RAID 0 disk arrays. This

 

 

 

0 + 1

level provides striping and redundancy through

4

 

 

mirroring.

 

 

 

 

 

 

 

 

 

Striping over the two RAID 1 disk arrays. This

 

 

 

10

level provides mirroring and redundancy through

4

 

 

striping.

 

 

 

 

 

 

 

 

JBOD

The abbreviation of “Just a Bunch Of Disks”.

1

 

JBOD needs at least one hard drive.

 

 

 

 

 

 

 

 

 

 

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APC iSCSI SATA II installation and configuration manual RAID Management, RAID Level Description Min. Drives