I'm setting up a MongoDB cluster on Amazon EC2 instances and the documentation says...
...for best performance we recommend separate volumes for data files, the journal, and the log. Each has different write behavior, and placing them on separate volumes reduces I/O contention.
Then it follows up with...
Note: Using different storage devices will affect your ability to create snapshot-style backups of your data, since the files will be on different devices and volumes.
But it doesn't say what affect that might be.
I'm guessing that the affect is that it completely removes your ability to do snapshot style backups while the instance is running?
If I were to stop the MongoD service so that the data file, journal and log are no longer being written and snapshot all three, will I still get a safe restorable backup?