Can anyone verify this statement by NetApp’s CEO in Byte and switch?
Dan Warmenhoven, CEO of Network Appliance. “NetApp provides customers with the best storage utilization rates in the industry, allowing them to decrease their total cost of ownership and increase their return on investment.”

If you look at this analysis of a NetApp filer you will see that NetApp parity, NetApp’s file system and NetApp’s right sizing of NetApp disks take a significant proportion of the NetApp storage a customer purchases In this example, usable NetApp storage and NetApp set asides are about equal. Can it be that other storage vendors are worse at managing storage assets? It would be interesting to get these results from other vendors also.

At the end of the day, your cost of NetApp storage is dependant on how much of the raw storage capacity is used by the vendor’s file system and overhead.