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Figure 3-3 displays an example of a RAID 5 array.

F i g u r e 3 - 3 . R A I D 5 A r r a y

Data Flow

Disk 1

Disk 2

Disk 3

Disk 4

Disk 5

Disk 6

Segment 1

Segment 2

Segment 3

Segment 4

Segment 5

Segment 6

Segment 7

Segment 8

Segment 9

Segment 10

Segment 11

Segment 12

Parity (9–12)

 

Parity (5–8)

 

Parity (1–4)

 

Note: Parity is distributed across drives in the array.

RAID 10

RAID 10 is a combination of RAID 0 and RAID 1. RAID 10 has mirrored drives. RAID 10 breaks up data into smaller blocks, and then mirrors the blocks of data to each RAID 1 RAID set. Each RAID 1 RAID set then duplicates its data to its other drive. The size of each block is determined by the stripe size parameter, which is set during the creation of the RAID set. RAID 10 can sustain one to four drive failures while maintaining data integrity if each failed disk is in a different RAID 1 array.

Table 3-5 provides an overview of RAID 10.

48

RAID Levels

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Dell manual Displays an example of a RAID 5 array, G u r e 3 3 . R a I D 5 a r r a y