I use this command to hang up a mongodb in background and set dbpath to mount:

sudo mongod –dbpath /mnt/volume-nyc1-04/mongodata2 –fork –logpath /var/log/mongod.log –bind_ip 127.0.0.1

this works well for mongodata, but for mongodata2 whenever i type into command line the whole server just keep crashing and i have to log into console and power on.

This mongodata2 is a large db (300GB) with large collection (3billion rows). I am wondering what could cause the server crashing?