Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 21)

Understanding RAID Concepts and Levels
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Figure 5. RAID 6 Configuration Example
RAID 10
RAID 10 is a combination of striped and mirrored arrays for fault tolerance
and high performance.
When drives are configured as a striped mirrored array, the disks are
configured using both RAID 0 and RAID 1 techniques (see Figure 6). A
minimum of four drives are required to use this technique. The first two drives
are mirrored as a fault-tolerant array using RAID 1. The third and fourth
drives are mirrored as a second fault-tolerant array using RAID 1. The two
mirrored arrays are then grouped as a striped RAID 0 array using a two-tier
structure. Higher data transfer rates are achieved by leveraging TwinStor
technology and striping the arrays.
In addition, RAID 10 arrays offer a higher degree of fault tolerance than
RAID 1 and RAID 5 because the array can sustain multiple drive failures
without data loss. For example, in a 12-drive RAID 10 array, up to 6 drives
can fail (half of each mirrored pair) and the array continues to function. Note
that if both halves of a mirrored pair in the RAID 10 array fail, all of the data
is lost.
(600 GB - 240 GB for 2 parity drives)