Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung PDF herunterladen (Seite 73)

Glossary

Manual No. 775012 G-15

RAID Levels

Mylex disk array controllers support four RAID Advisory Board approved

(RAID 0, RAID 1, RAID 3, and RAID 5), two special (RAID 0+1, and

JBOD), and three spanned (RAID 10, 30, and 50) RAID levels. All

DAC960, AcceleRAID, and eXtremeRAID series controllers support these

RAID levels.

Level 0: Provides block “striping” across multiple drives, yielding higher

performance than is possible with individual drives. This level does not

provide any redundancy.

Level 1: Drives are paired and mirrored. All data is 100 percent duplicated

on a drive of equivalent size.

Level 3: Data is “striped” across several physical drives. Maintains parity

information, which can be used for data recovery.

Level 5: Data is “striped” across several physical drives. For data

redundancy, drives are encoded with rotated XOR redundancy.

Level 0+1: Combines RAID 0 striping and RAID 1 mirroring. This level

provides redundancy through mirroring.

JBOD: Sometimes referred to as “Just a Bunch of Drives.” Each drive is

operated independently like a normal disk controller, or drives may be

spanned and seen as a single drive. This level does not provide data

redundancy.

Level 10: Combines RAID 0 striping and RAID 1 mirroring spanned across

multiple drive groups (super drive group). This level provides redundancy

through mirroring and better performance than Level 1 alone.

Level 30: Data is “striped” across multiple drive groups (super drive group).

Maintains parity information, which can be used for data recovery.

Level 50: Data is “striped” across multiple drive groups (super drive group).

For data redundancy, drives are encoded with rotated XOR redundancy.

Note: The host operating system drivers and software utilities remain

unchanged regardless of the level of RAID installed. The controller makes

the physical configuration and RAID level implementation.

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Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung Seite 73