IBM 86655RY Hardware Maintenance Manual - Page 211

Note: RAID level-x0 is only available on the IBM ServeRAID-4H and ServeRAID-4L Ultra160 SCSI controllers. RAID level-x0 requires a minimum of 2 drives and supports a maximum of 60 drives. The following illustration is an example of a RAID level-10 logical drive. Start with six physical drives. Create three arrays (labeled A, B, and C), each array using two physical drives. A B C Then, create a spanned array (labeled as 1) that spans the three arrays. 11 A B C A sub-logical drive is created within each array (A, B, and C). Then, the data is striped across the physical drives in the array, creating blocks. Notice that, in each array, the data on the drive on the right is a copy of the drive on the left. This is because the sub-logical drives (A, B, and C) are RAID level-1 in a RAID level10 implementation (see the following table). A 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 11 B 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 C 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 Installing and configuring ServeRAID controllers 201