Promise Technology VessRAID 1720i, Product Manual

Page: 271 / 354

Chapter 8: Technology Background
255
RAID 60 Axles
When you create a RAID 60, you must specify the number of axles. An axle
refers to a single RAID 6 logical drive that is striped with other RAID 6 logical
drives to make RAID 60. An axle can have from 4 to 16 physical drives,
depending on the number of physical drives in the logical drive.
The chart below shows RAID 60 logical drives with 8 to 20 physical drives, the
available number of axles, and the resulting distribution of physical drives on
each axle.
RAID 60 Logical Drive
No. of
Drives
No. of
Axles
Drives per
Axle
No. of
Drives
No. of
Axles
Drives per
Axle
8 2 4,4 17 2 8,9
9 2 4,5 3 5,6,6
10 2 5,5 4 4,4,4,5
11 2 5,6 18 2 9,9
12 2 6,6 3 6,6,6
3 4,4,4 4 4,4,5,5
13 2 6,7 19 2 9,10
3 4,4,5 3 6,6,7
14 2 7,7 4 4,5,5,5
3 4,5,5 20 2 10,10
15 2 7,8 3 6,7,7
3 5,5,5 4 5,5,5,5
16 2 8,8 5 4,4,4,4,4
3 5,5,6
4 4,4,4,4