This is yet another Linux success story. PayPal says Linux grid can replace IBM mainframes:
PayPal is currently processing $1,571 worth of transactions per second in 17 different currencies on about 4,000 servers running Red Hat Linux. Thompson supervises a payment system that operates on about 4,000 servers running Red Hat Linux in the same manner that eBay and Google conduct their business on top of a grid of Linux servers. “I have been pleasantly surprised at how much we’ve been able to do with this approach. It operates like a mainframe,” he said.
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Wow that is some amazing amounts of money processed per second. that’s like $100 million a day