RAID 0+1 versus RAID 5 Calculations
As can be seen in this example, RAID 5 looks to be the better choice when using 10K 146-GB drives. However, it is important to look at different types of drives when doing these calculations. For example, if a drive that has 300 GB is substituted for the 146-GB drives and if all other characteristics remain the same, then the choices drastically change.
Using 300-GB drives, RAID 0+1 requires just 4 drives to meet both capacity and performance characteristics. RAID 5 will require 3 drives to meet capacity but 6 drives to meet performance requirements. By changing the size of the drive, the best choice changed as well.
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