APC RAID Subsystem SCSI-SATA II User Manual download pdf (Page 38)

SCSI to SATA II RAID Subsystem

User Manual

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

Linear

Linear is similar to RAID 0 in that it combines 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. There is

no data redundancy.

Block striping is provide, which yields higher

performance than with individual drives. There is no

redundancy.

Drives are paired and mirrored. All data is 100%

duplicated on an equivalent drive. Fully redundant.

Data is striped across several physical drives. Parity

protection is used for data redundancy.

Data is striped across several physical drives. Parity

protection is used for data redundancy.

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

0 + 1

Combination of RAID levels 0 and 1. This level provides

striping and redundancy through mirroring.

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.

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.

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APC RAID Subsystem SCSI-SATA II User Manual Page 38