H3C UniServer E3200 G3 User Manual page 397

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
RAID 10, first configure RAID 1 and then RAID 0.
Figure 10, RAID 10 is a nested RAID level combining RAID 1 and RAID 0. To configure
8