Speaking of defaults, if you install Mongo on EC2 using a default instance of Ubuntu using the default engine, Wired Tiger, you will get ceaseless server crashe

Speaking of defaults, if you install Mongo on EC2 using a default instance of Ubuntu using the default engine, Wired Tiger, you will get ceaseless server crashes. Wired Tiger is NOT STABLE on the default volume - ext4. You have to use xfs. This was only recently added as a startup check.