Chuck really checked his calculations before he wrote them down. He is talking about a 254 disk EVA, however the maximum disk capacity of the EVA8100 is 240 disks. I wonder where he put the extra 14 disks.....

Then he makes some wonderful calculations. He could have used the the Storageworks Sizing Tool, it is even downloadable for EMC people. Using that tool, and setting up 7 disk groups with double protection and 90% occupancy, a 240 disk EVA8100 with 35040GB raw disk capacity will give me 24759GB usable capacity, and that is appr. 71% .

Maybe Chuck should just buy an EVA and set it up. Or ask his engineers to set one up, I'm sure they have an EVA in their lab somewhere.