82 | 5 Configuring IDE Software RAID |
Selecting a RAID Level
To ensure the best performance, you should select the optimal RAID level when you create a system drive. The optimal RAID level for your disk array depends on the following factors:
•Number of drives in the disk array
•Capacity of the drives in the array
•Need for data redundancy
•Disk performance requirements
The factors you need to consider when selecting a RAID level are listed below.
RAID | Description | Pros | Cons | Number of | Fault |
Level | and Use |
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| Drives | Tolerant |
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0 | Data divided | High data | No fault | One to | No |
| in blocks and | throughput | tolerance. All | Four |
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| distributed | for large files. | data lost if |
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| sequentially |
| any drive |
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| (pure |
| fails. |
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| striping). Use |
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| for non- |
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| critical data |
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| that requires |
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| high |
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| performance. |
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1 | Data | 100 percent | Double disk | Two | Yes |
| duplicated on | data | space. |
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| another disk | redundancy | Reduced |
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| (mirroring). |
| performance |
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| Use for read- |
| during |
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| intensive |
| rebuilds. |
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| fault tolerant |
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| systems |
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10 | Data divided | 100 percent | A minimum | Four | Yes |
| in blocks and | data | of four drives |
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| distributed | redundancy | required. |
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| sequentially | and High data |
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| and each | throughput. |
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| block is |
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| duplicated to |
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| another disk. |
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