Unable to start mongod daemon and it looks its crashing
Wernfried Domscheit said:

You don't need to copy any data in a replicat set. Just remove entire directory and start the service. The replicat set will trigger an inital sync and copies all data. In case you like to take a copy from dbPath you should stop the service or at least lock it with db.fsyncLock() (and of course unlock afterwards with db.fsyncUnlock())

db.fsyncLock() &amp; db.fsyncUnlock() did work and I fixed the chronic replication.