LSI 3ware SAS 9750-8i Betriebsanweisung PDF herunterladen (Seite 20)

Introducing the LSI 3ware SATA+SAS RAID Controller Card

8 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.0

RAID 6

RAID 6 provides greater redundancy and fault tolerance than RAID 5. It is

similar to RAID 5, but has two blocks of parity information (P+Q) distributed

across all the drives of a unit, instead of the single block of RAID 5.

Due to the two parities, a RAID 6 unit can tolerate two hard drives failing

simultaneously. This also means that a RAID 6 unit may be in two different

states at the same time. For example, one sub-unit can be degraded, while

another may be rebuilding, or one sub-unit may be initializing, while another

is verifying.

The 3ware implementation of RAID 6 requires a minimum of five drives.

Performance and storage efficiency also increase as the number of drives

increase.

Figure 5. RAID 6 Configuration Example

RAID 10

RAID 10 is a combination of striped and mirrored arrays for fault tolerance

and high performance.

When drives are configured as a striped mirrored array, the disks are

configured using both RAID 0 and RAID 1 techniques, thus the name RAID

10 (see Figure 6). A minimum of four drives are required to use this

technique. The first two drives are mirrored as a fault tolerant array using

RAID 1. The third and fourth drives are mirrored as a second fault tolerant

array using RAID 1. The two mirrored arrays are then grouped as a striped

RAID 0 array using a two tier structure. Higher data transfer rates are

achieved by leveraging TwinStor and striping the arrays.

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LSI 3ware SAS 9750-8i Betriebsanweisung Seite 20