8
Figure 9 RAID 6
Application scenarios
RAID 6 is most useful when data loss is unacceptable, but cost is also an important factor. Data loss
is less likely to occur in an array configured with RAID 6 than an array configured with RAID 5.
Advantages
Has a high read performance.
Has high data availability because any two drives can fail without loss of critical data.
More drive capacity is usable than with RAID 10 because parity information requires only the
storage space equivalent to two physical drives.
Disadvantages
The main disadvantage of RAID 6 is a relatively low write performance (lower than RAID 5),
because of the need for two sets of parity data.
RAID 10
As shown in Figure 10, RAID 10 is a nested RAID level combining RAID 1 and RAID 0. To configure
RAID 10, first configure RAID 1 and then RAID 0.
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