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50 RAID Levels
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Figure 3-4. RAID 10 Array
RAID 50
RAID 50 provides the features of both RAID 0 and RAID 5. RAID 50
includes both parity and disk striping across multiple drives. RAID 50 is best
implemented on two RAID 5 disk arrays with data striped across both disk
arrays.
RAID 50 breaks up data into smaller blocks, and then stripes the blocks of
data to each RAID 5 array. RAID 5 breaks up data into smaller blocks,
calculates parity by performing an exclusive-or on the blocks, and then
writes the blocks of data and parity to each drive in the array. The size of
each block is determined by the stripe size parameter, which is set during
the creation of the RAID set.
RAID 1
Disk 2
D
Data Flow
Disk 1 Disk 4Disk 3
RAID 1
RAID 0
Segment 1
Segment 3
Segment 5
Segment 1
Segment 3
Segment 5
Segment 2
Segment 4
Segment 6
Segment 2
Segment 4
Segment 6