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Intel® Server RAID Controller U3-1 Manual, page 5-16.
"This RAID level is not user selectable. In arrays with more than 2 disks (see Figures below) a RAID 1 volume still writes each data element twice, but it utilizes all the disks in the array. Some vendors refer to this as RAID 10 or 0+1, since it is a combination of RAID 0 and 1. This increases performance by spreading the load across all the disks. In addition to good performance, this type of array also provides high reliability but its usable capacity is one half of its physical capacity. In the event one disk fails, data integrity is maintained."
RAID 10 with Three Disks
RAID 10 with Five Disks 
Intel® Server RAID Controller - RAID Configuration Utility, page 8
"Four or more drives allow creation of RAID 0, RAID 1, RAID 5, or RAID 10 (Mirrored and Striped) volumes, and the creation of global hot spares."
Implementation of RAID 10
RAID 10 on the SRCU21, SRCU31, and SRCU31-L Intel RAID cards is implemented the same way as RAID 1, but with 3 or more drives being used. As stated in the manual, it is not a user selectable item. Nor is the status displayed as RAID 10. The only difference you will see is that it is RAID 1 using 3 or more drives.
Here is an example of a creation of a RAID 10 array using 4 drives:
Here is how the RAID 10 array is displayed in the RAID Configuration Utility (RCU):
Here is how the RAID 10 array is displayed in the Storage Console:
Other Definitions of RAID 10
Other definitions of RAID 10 can be found at the following URLs:
This applies to:
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