Interesting performance stats, and 12 billion documents is a fairly substantial amount of data.
This is the first time I've seen major use of GridFS too:
We now store our audio files in MongoDB’s GridFS. Previously we used a clustered file system so files could be read and written from multiple servers. This created a huge amount of complexity from the IT operations point of view, and it meant that system backups (database + audio data) could get out of sync. Now that they’re in Mongo, we can reach them anywhere in the data center with the same mongo driver, and backups are consistent across the system.
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