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Using IBM ServeRAID 125
Note: The ServeRAID Manager program Express configuration does not default to
RAID level-5E. If you have four physical drives, Express configuration
defaults to RAID level-5 with a hot-spare drive.
Selecting a RAID level and performance tuning
When selecting a RAID level for the system, consider the following:
1
2
Drive state descriptions
This section provides descriptions of the physical and logical drive states.
1.Depending on the number of physical drives in the array.
2.Performance depends on the number of drives in the array. Generally, the more drives in the array, the better the performance.
RAID level Description
RAID level-0 Data redundancy: No
Hard disk drive capacity utilization: 100%
Read performance: Excellent
Write performance: Excellent
Built-in spare drive: No
RAID level-1 Data redundancy: Yes
Hard disk drive capacity utilization: 50%
Read performance: Very good
Write performance: Very good
Built-in spare drive: No
RAID level-
1E
Data redundancy: Yes
Hard disk drive capacity utilization: 50%
Read performance: Very good
Write performance: Very good
Built-in spare drive: No
RAID level-5 Data redundancy: Yes
Hard disk drive capacity utilization: 67% to 94%
Read performance: Excellent
Write performance: Good
Built-in spare drive: No
RAID level-
5E
Data redundancy: Yes
Hard disk drive capacity utilization: 50% to 88%
Read performance: Excellent
Write performance: Good
Built-in spare drive: Yes
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