Chapter 6: Technology Background

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

 

 

 

163

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Promise Technology EX8650A, EX4650A user manual RAID 50 Axles
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