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48 RAID Levels
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Figure 3-3 displays an example of a RAID 5 array.
Figure 3-3. RAID 5 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.
Segment 1
Segment 7
Parity (9–12)
Segment 2
Segment 8
Segment 3
Segment 9
Parity (5–8)
Segment 4
Segment 10
Disk 1 Disk 2 Disk 3 Disk 4 Disk 5 Disk 6
Segment 5
Segment 11
Parity (1–4)
Segment 6
Segment 12
Data Flow
Note: Parity is distributed across drives in the array.