I see what you're doing Rick, and it is a cheap way to milk the last drips of performance out, but man I'd be lost with noatime set. I think if I were that tight on I/O headroom I'd have to consider a physical upgrade before I'd run with noatime. On the occasion where something breaks (something always does) and you need to figure out when and how you're giving up a pretty good tool that you could use to help investigate. I view it as a pay me now or pay me later decision. I guess it depends on the position you're in and your risk assessment. For some running noatime doesn't pose much risk, but for me I'd view it as a large risk.
Definitely food for thought. Nice post.
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