It's that last 5-10% that's worth the millions of dollars in revenue. And that last little bit has thousands of man hours behind it.

I didn't mean to imply that the commercial products weren't built on top of open source platforms - they ALL are. But that there is no pre-packaged open source solution that does what the commercial products do. So you'll have to get the base open source platform and tools, then you'll have to spend probably the rest of the foreseeable future working on a custom solution to that last 10% - or pay someone else to develop it ($1 million? 2 Million?)

OpenFiler? No. FreeNAS? No. Etc.