Product manual

Chapter 9: Technology Background
339
RAID 30 and 50 Axles
When you create a RAID 30 or RAID 50, you must specify the number of axles.
An axle refers to two or more RAID 3 logical drives striped together to make a
RAID 30. Or an axle could be two or more RAID 5 logical drives striped together
to make a RAID 50.
An axle can have from 3 to 32 physical drives, depending on the number of
physical drives in the logical drive. The chart below shows RAID 30 and 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 30 and 50 Logical Drive
No. of
Drives
No. of
Axles
Drives per
Axle
No. of
Drives
No. of
Axles
Drives per
Axle
6 2 3,3 14 2 7,7
7 2 3,4 3 4,5,5
8 2 4,4 4 3,3,4,4
9 2 4,5 15 2 7,8
3 3,3,3 3 5,5,5
10 2 5,5 4 3,4,4,4
3 3,3,4 5 3,3,3,3,3
11 25,6 1628,8
3 3,4,4 3 5,5,6
12 2 6,6 4 4,4,4,4
3 4,4,4 5 3,3,3,3,4
4 3,3,3,3
13 2 6,7
3 4,4,5
4 3,3,3,4