Promise Technology E610f Manuale Pagina 293

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Chapter 7: Technology Background
271
The chart below shows RAID 50 logical drives with 6 to 32 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
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
Advantages Disadvantages
High Read data transaction rate
Medium Write data transaction
rate
Good aggregate transfer rate
High reliability
Supports large volume sizes
Higher disk overhead than
RAID 5
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