ATTO Technology SC 5700 operation manual RAID Level 0 striping, no redundancy

RAID Level 0: striping, no redundancy

RAID Level 0 (striping) is based on the fact that increased performance can be achieved by simultaneously accessing data across multiple drives, increasing data transfer rates while reducing average access time by overlapping drive seeks. Drives are accessed alternately, as if stacked one on top of the

other. RAID Level 0 provides no data protection. If one drive fails, all data within that stripe set is lost.

RAID Level 0 is used by applications requiring high performance for non-critical data.

The ATTO FastStream supports 2 to 16 drives per RAID Level 0 group.

	Disk 1	Disk 2	Disk 3	Disk 4
Stripe 1	Data 1	Data 2	Data 3	Data 4
Stripe 2
	Data 5	Data 6	Data 7	Data 8
Stripe 3
	Data 9	Data 10	Data 11	Data 12

RAID Level 1: mirroring (duplicate drives)

RAID Level 1 ensures the security of data by writing the exact same data simultaneously to two different drives. With RAID Level 1, the host sees what it believes to be a single physical drive of a specific size: it does not know about the mirrored pair.

This application is used for critical data which cannot be at risk to be lost or corrupted due to the failure of a single drive.

The ATTO FastStream supports an even number of 2 to16 drives per RAID Level 1 group.

Disk 1	Disk 2
Data 1	Data 1
Data 2	Data 2
Data 3	Data 3

RAID Level 1 plus additional mirroring

RAID Level 1 with multiple mirrors uses at least 3 drives with the same data on each drive. This application offers the highest fault-tolerance with good

performance, especially for small database applications.

RAID Level 1: additional mirror

Disk 1	Disk 2	Disk 3
Data 1	Data 1	Data 1
Data 2	Data 2	Data 2
Data 3	Data 3	Data 3

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