We had a 50gb instance initially and it was no problem, then our app started to get a lot more traffic in a short period of time. We had to start sharding on a

We had a 50gb instance initially and it was no problem, then our app started to get a lot more traffic in a short period of time. We had to start sharding on a reasonably large scale. Mongo is a lot harder to maintain when it's big and unpredictable. I know this sounds like a plug, alas it's the truth, we found Object Rocket and now we don't worry about Mongo.