Just as an FYI, when you are serving high volume static content, the RAM is used mainly as disk cache. If you have more RAM than content, the disk will almost never be used.. this is ideal. If you have more content than RAM, then the disk will be used to access the less popular content.
If you have shitloads of content, and lots of it is popular/hot all at once, and you only have a little RAM, you're fucked. You will be constantly swapping, and that will make it look like the server is too slow.
If you start seeing server load, or vmstat reports high numbers for disk activity, upgrade the ram.
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