I am having some troubles with MongoDB and space usage. In particular, I once used to have a large collection of about 600 million records totaling 110+ GB on disk. Recently I decided to drop it because the data was outdated, to do so I dropped the collection through rockmongo's web interface. Accordingly, rockmongo doesn't show me the collection anymore, however my disk usage hasn't changed at all.
Is there any clean operation which I am not aware of, which must be run in order to synchronize the database with database files on disk?
I have tried to perform a "repair" but the system complains that there's not enough space on disk ... that's because it is all used by MongoDB.