RAID 5 Calculations
To calculate the number of drives necessary to meet the storage requirements with RAID 5, the Total Storage Requirements needs to be multiplied by 1.2 to adjust for parity storage requirements. This value is then divided by the Drive Actual Size and then rounded up. For this example, 5 drives are needed for RAID 5 to meet the storage requirements:
5 = ROUNDUP((540*1.2)÷132)
To calculate the number of drives required to meet the performance requirements with RAID 5, multiply the Number of Write IOPS by 4 and add the Number of Read IOPS. Divide this total by the Calculated Drive IOPS and round the result up. For this example, 6 drives are needed for RAID 5 to meet the performance requirements:
6 = ROUNDUP(((140*4)+140)÷125) ...
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