System Configuration Setup | 161 |
Configuring MegaRAID IDE |
RAID | Minimum Number of | Maximum Number of |
Level | Physical Drives | Physical Drives |
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0 | One | Two |
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1 | Two | Two |
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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:
cNumber of drives in the disk array
cCapacity of the drives in the array
cNeed for data redundancy
cDisk performance requirements
The Factors you need to consider when selecting a RAID level are listed below.
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| Max. | Fault |
Level | Description and Use | Pros | Cons | Drives | Tolerant |
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0 | Data divided in blocks | High date through- | No fault tolerance. | One to | No |
| and distributed sequen- | put for large files. | All data lost if any | Two |
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| tially (pure striping). |
| drive fails. |
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| Use for |
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| that requires high perfor- |
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| mance. |
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1 | Data duplicated on | 100 percent data | Doubles disk | Two | Yes |
| another disk (mirror- | redundancy. | space. Reduced |
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| ing). Use for |
| performance dur- |
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| sive |
| ing rebuilds. |
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| systems. |
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Configuring Arrays
After you have attached all physical disk drives, perform the following actions to prepare a RAID disk array: