Like how you need an architect to design your virtualization environment, an architect has to sit and size the storage. For example you need 30 IOPS for 600 machines. That is 600*30 at an average which is 18000. A FC disk of 15K RPM disk of 2TB would give around 180 IOPS per disk. So if you have a RAID 5 Configuration you will need around 140 Disks. Again this is a very rough estimation. It also depends on the percentage of read and write, penalty and many other things.
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