This is a known-bad configuration (SERVER-18314, DOCS-5506, DOCS-7104). Therefore, if a mongod is started this way, inform the user by logging a startup warning (like we do for NUMA, THP, readahead, etc).
is related to
SERVER-27221Startup warning about using XFS doesn't actually check for XFS
SERVER-18314Stall during fdatasync phase of checkpoints under WiredTiger and EXT4
SERVER-27218Startup warning recommending the use of XFS isn't displayed properly in Mongo Shell