Jetstress: Performance characteristic is more realistic when 80% of the disk capacity is utilized.

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Some tests showed that using 70% or 80% of the disk capacity can show the realistic performance characteristic.

The achieved IO is up to 100% more than what you can really get when 80% of the disk is utilized in terms of its capacity. Refer to a TechNet traing session slide: https://download.microsoft.com/documents/uk/technet/learning/downloads/evenings/Exchange_2003_Storage_Design_Brad_Carter_14th_July.ppt

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