It depends on how many queries you'd be making per second. I know for us, I have a gradient of index sizes. The first machine, which gets hit most often is about 2.5 gigs. Most of the queries would only ever need to hit this index but then I have a bigger indices of about 5-10 gigs each which are slower, but don't get queried as often so I can afford them to be a little slower (and hence the bigger index)
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