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46 RAID Levels
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Figure 3-2. RAID 1 Array
RAID 5
RAID 5 includes disk striping at the block level and parity. In RAID 5, the
parity information is written to several drives. RAID 5 is best suited for
networks that perform a lot of small input/output (I/O) transactions
simultaneously.
RAID 5 addresses the bottleneck issue for random I/O operations. Because
each drive contains both data and parity numerous writes can take place
concurrently. In addition, robust caching algorithms and hardware based
exclusive-or assist make RAID 5 performance exceptional in many different
environments.
Table 3-4 provides an overview of RAID 5.
Segment 1
Segment 2
Segment 3
Segment 1 Duplicated
Segment 2 Duplicated
Segment 3 Duplicated
Segment 4 Segment 4 Duplicated