I do *almost* the same exact thing, for a similarly large (and growing) archive
agreed on the notion that "The distributive properties of MD5 garantuee a good spread among buckets.". You should never do this with numbers, but if you must, you can reverse the numbers to get a decent distribution ( ie - 12345 -> 54321 )
another difference that i do is the following-- i name the file the md5, and store the original file name in postgres. that gives me a speedup on fileserving.
its relatively simple to create rewrite rules under apache & nginx to directly serve these files too.
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