User's Manual

 LSI2108/2208SASMegaRAIDCongurationUtilityUser'sManual

1-4

1-2 RAID Levels Supported by the 2108/2208 Controller

The LSI Embedded MegaRAID Software Conguration Utility adds RAID functions

to enhance system efciency and data security by supporting RAID 0, RAID 1, RAID

10, RAID 5, RAID 6, RAID 50 and RAID 60. .

Note: A maximum of 16 physical disk drives is supported for RAID.

RAID 0

RAID 0 (Integrated Striping) can greatly enhance hard disk I/O performance by strip-

ing data across all disk drives in an array or drive group. This RAID conguration

does not provide data redundancy, but it offers the best RAID performance and a

high bandwidth. The following illustration provides a visual example of a RAID 0

drive group.

Segment 1

Segment 3

Segment 5

Segment 7

Segment 2

Segment 4

Segment 6

Segment 8

Drive A

Drive B

RAID 1

RAID 1 (Integrated Mirroring) allows data to be simultaneously written to multiple

drives. This RAID conguration increases data integrity by providing redundancy,

but requires twice the amount of data storage capacity. RAID 1 requires 2 drives.

The following illustration provides a visual example of a RAID 1 drive group.

Segment 1

Duplicate

Segment 3

Duplicate

Segment 3

Drive A

Drive B

RAID 1

Segment 2

Duplicate

Segment 4

Duplicate

Segment 4

Drive C

Drive D

RAID 1

RAID 0 Example

RAID 1 Example