[FastCoyote]

"What estimate of their number of servers, by whom? Did it break them down by O/S as well? Doubtful since it was an estimate to begin with."

Thanks for the apology. I guarantee there are other grid farms running linux that are huge, they just don't get advertised. Hell, windows didn't even have grid capability till recently and it's crippled and they charge for it. So any serious gridder is not doing Microsoft.

[Golden Eagle]

"20,000 node networks" isn't automatically associated with clusters, in fact they usually peak out around 1 to 2 thousand nodes. I said most 20,000 node networks don't run on open source and that is still an accurate statement, since most every one of them in existence runs on something proprietary.