Planning the Array Configuration
Answer the following questions about this array:
| Question | Answer |
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| Number of MegaRAID SCSI channels | 4 |
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| Number of physical disk drives in the array |
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| Purpose of this array. Rank the following factors: |
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| Maximize drive capacity |
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| Maximize the safety of the data (fault tolerance) |
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| Maximize hard drive performance and throughput |
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| How many hot spares? |
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| Amount of cache memory installed on the MegaRAID |
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| Are all of the disk drives and the server that MegaRAID is |
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| installed in protected by a UPS? |
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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 eight drives.
The following 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 1requires two drives. RAID 10 requires at least four drives. RAID 30 and RAID 50 require at least six drives.
44MegaRAID Enterprise 1600 Hardware Guide