One of the more useful Mongo articles I've seen here. You might want to clear up "You cannot shard a collection over 256G" however. The limitation is that if

One of the more useful Mongo articles I've seen here. You might want to clear up "You cannot shard a collection over 256G" however. The limitation is that if you have an unsharded collection that grows over 256GB you cannot make it a sharded collection. The way it's written now makes it sound like sharded collections can't grow over 256GB (at least to me) which isn't true.