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Table 6. RAID 10
●
Appropriate when used with data storage that needs 100 percent redundancy of mirrored drive groups and that
also needs the enhanced I/O performance of RAID 0 (striped drive groups)
●
Works well for medium-sized databases
Provides both high data transfer rates and complete data redundancy
Requires twice as many drives as all other RAID levels
4 through 32 in multiples of 4 (limited by the maximum number of drives supported by the controller using an even
number of drives in each RAID 10 virtual drive in the span)
Figure 7. RAID 10 Drive Group
RAID 50
RAID 50 is a combination of RAID 5 and RAID 0 (5 + 0). RAID 50 includes both parity and disk striping across
multiple drive groups. It is best implemented on two RAID 5 drive groups with data striped across both drive
groups.
RAID 50 divides data into smaller blocks and then stripes the blocks of data to each RAID 5 disk set. RAID 5
divides data into smaller blocks, calculates parity by performing an exclusive-or operation on the blocks, and then
writes the blocks of data and parity to each drive in the drive group. The size of each block is determined by the
stripe size parameter, which is set during the creation of the RAID set.
RAID 50 can support up to eight spans and tolerate up to eight drive failures, though less than the drive capacity is
available. Although multiple drive failures are tolerated, only one drive failure is tolerated in each RAID 5 drive
group.
RAID 50 is excellent for environments that require high reliability, high request rates, high data transfer, and
medium-sized to large capacity. Table 7 provides an overview of RAID 50. Figure 8 shows an example of RAID 50
use.
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