IBM 86655RY - Netfinity 7600 - 8665, Hardware Maintenance Manual, Page: 211 / 294

Installing and configuring ServeRAID controllers
201
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.
Then, create a spanned array (labeled as 1) that spans the three arrays.
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 level-
10 implementation (see the following table).
A A B C A
A A
B C
111
A
1
A A
B C
1
1
2
3
4
5
7
6
8
1
2
3
4
5
7
6
8
1
2
3
4
5
7
6
8
1
2
3
4
5
7
6
8
1
2
3
4
5
7
6
8
1
2
3
4
5
7
6
8
11
A
1