Roger Ehrenberg, the former CEO of Deutsche Bank Advisors LLC and an ex-MD at Citibank analysed in a blog post the arbitrage opportunities that would have come up during the mismatch between the real DJIA and displayed DJIA. He points to automated programs doing statistical arbitrage that would have been able to notice the discrepancy and trade to take advantage.
Since quite a few of the brightest techies are writing pricing/risk/trading engines on Wall Street, can we get a feel from Slashdotters on the extent of automated trading programs out there? What is the scope of their algorithmic trading? Also, do these systems run on typical Unix systems, and what is the nature of experience of the techies who would code these systems?"
There's no real change here for ZFS, and it's unlikely that anything at the memory cache level even knows about the copy-on-write-ness of ZFS (or even cares).