Okay, yes: The db server stays up when using the default path.
(Now I have an error regarding my multer-gridfs-storage connection from my express api, which doesn’t exist in my local version… I set the env vars when launching in pm2, so not sure what th- e issue is, but I’ll investigate tomorrow. Now back to topic!)
Please tell me how I can keep the server up, whilst storing all my user data in subdirs of /data
Thanks for your support 
Sam