Array Configuration Planner
Using the Array Configuration Planner The following table lists the possible RAID levels, fault tolerance, and effective capacity for all possible drive configurations for an array consisting of one to seven drives. This table does not take into account any hot spare (standby) drives. You should always have a hot spare drive in case of drive failure. RAID 1 requires two physical drives. RAID 3 and RAID 5 require at least three drives. RAID 10 requires at least four drives, while RAID 30 and RAID 50 require at least six drives.
Number of | Possible | Relative | Fault | Effective |
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| Drives | RAID Levels | Performance | Tolerance | Capacity |
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1 | None | Excellent | No | 100% |
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1 | RAID 0 | Excellent | No | 100% |
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2 | None | Excellent | No | 100% |
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2 | RAID 0 | Excellent | No | 100% |
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2 | RAID 1 | Good | Yes | 50% |
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3 | None | Excellent | No | 100% |
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3 | RAID 0 | Excellent | No | 100% |
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3 | RAID 3 | Good | Yes | 67% |
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3 | RAID 5 | Good | Yes | 67% |
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4 | None | Excellent | No | 100% |
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4 | RAID 0 | Excellent | No | 100% |
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4 | RAID 3 | Good | Yes | 75% |
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4 | RAID 5 | Good | Yes | 75% |
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4 | RAID 10 | Good | Yes | 50% |
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5 | None | Excellent | No | 100% |
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5 | RAID 0 | Excellent | No | 100% |
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5 | RAID 3 | Good | Yes | 80% |
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5 | RAID 5 | Good | Yes | 80% |
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6 | None | Excellent | No | 100% |
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6 | RAID 0 | Excellent | No | 100% |
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6 | RAID 3 | Good | Yes | 83% |
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6 | RAID 5 | Good | Yes | 83% |
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6 | RAID 10 | Good | Yes | 50% |
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6 | RAID 30 | Good | Yes | 67% |
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6 | RAID 50 | Good | Yes | 67% |
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7 | None | Excellent | No | 100% |
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7 | RAID 0 | Excellent | No | 100% |
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7 | RAID 3 | Good | Yes | 86% |
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7 | RAID 5 | Good | Yes | 86% |
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8 | None | Excellent | No | 100% |
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8 | RAID 0 | Excellent | No | 100% |
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8 | RAID 3 | Good | Yes | 87% |
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8 | RAID 5 | Good | Yes | 87% |
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8 | RAID 10 | Good | Yes | 50% |
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8 | RAID 30 | Good | Yes | 75% |
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8 | RAID 50 | Good | Yes | 75% |
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Chapter 5 Configuring MegaRAID Express 500 | 47 |