Promise Technology Network Device EX8654 - Manual (Page 241)

Chapter 7: Technology Background
227
RAID 50 Axles
When you create a RAID 50, you must specify the number of axles. An axle
refers to a single RAID 5 logical drive that is striped with other RAID 5 logical
drives to make RAID 50. An axle can have from 3 to 16 physical drives,
depending on the number of physical drives in the logical drive.
The chart below shows RAID 50 logical drives with 6 to 16 physical drives, the
available number of axles, and the resulting distribution of physical drives on
each axle.
RAID 50 Logical Drive
No. of Drives No. of Axles Drives per Axle
6 2 3,3
7 2 3,4
8 2 4,4
9 2 4,5
3 3,3,3
10 2 5,5
3 3,3,4
11 2 5,6
3 3,4,4
12 2 6,6
3 4,4,4
4 3,3,3,3
13 2 6,7
3 4,4,5
4 3,3,3,4
14 2 7,7
3 4,5,5
4 3,3,4,4