I'm using MongoDB 3.6.5 (already tested on 3.2 / 3.4) and i have enabled "directoryPerDB" in /etc/mongo.conf.

#mongod.conf

storage:
dbPath: /var/lib/mongodb
journal:
enabled: true
directoryPerDB: true

I created LVM disk's for my databases and symlinked in to /var/lib/mongodb

Here is problem:

When one of these lvm's is full, it will kill mongod service, so i can't use the rest of databases, where is free space on storage. Because of that, this will kill my primary node and subsequently the secondary node.

This is critical problem for us.

Your help will be greatly appreciated!