[root@noc sysconfig]# /usr/bin/mongod --storageEngine wiredTiger -f /etc/mongod.conf
about to fork child process, waiting until server is ready for connections.
forked process: 8413
ERROR: child process failed, exited with error number 100
[root@noc sysconfig]#

[root@noc sysconfig]# /usr/bin/mongod --storageEngine wiredTiger
2016-01-11T10:41:59.783+0300 I CONTROL  [initandlisten] MongoDB starting : pid=8365 port=27017 dbpath=/data/db 64-bit
2016-01-11T10:41:59.783+0300 I CONTROL  [initandlisten] db version v3.2.0