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Is there a way to get Cache Hit/Miss ratios for block devices in Linux?

I have a file server which serves out large (25GB-1TB+) files over the network from local storage. I'm trying to decide whether adding more RAM for the disk cache would help performance given our access patterns, but I can't see how to measure disk cache churn.

Is it possible?

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regularfry
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    What you're looking for is called a *cache miss*, which makes this question a duplicate of [Is there a way to get Cache Hit/Miss ratios for block devices in Linux?](http://serverfault.com/q/157612/64706). Short answer is "no". Long answer is "maybe you can make one using `stap`, but it might be dangerous". – bahamat Oct 02 '12 at 16:51
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    You can examine the contents of the filesystem cache using [the vmtouch tool](http://hoytech.com/vmtouch/). – ewwhite Oct 04 '12 at 17:41

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