The following problem occurred when directly executing mongod command

  mongodb, question

mongod –help for help and startup options
Tue Jul 5 12:17:49.091 [initandlisten] MongoDB starting : pid=17876 port=27017 dbpath=/data/db/ 64-bit host=lvpai-db-prod
Tue Jul 5 12:17:49.091 [initandlisten] db version v2.4.9
Tue Jul 5 12:17:49.091 [initandlisten] git version: nogitversion
Tue Jul 5 12:17:49.091 [initandlisten] build info: Linux orlo 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013 x86_64 BOOST_LIB_VERSION=1_54
Tue Jul 5 12:17:49.091 [initandlisten] allocator: tcmalloc
Tue Jul 5 12:17:49.091 [initandlisten] options: {}
Tue Jul 5 12:17:49.091 [initandlisten] exception in initAndListen: 10296


ERROR: dbpath (/data/db/) does not exist.
Create this directory or give existing directory in –dbpath.
Seehttp://dochub.mongodb.org/core/startingandstoppingmongo


, terminating
Tue Jul 5 12:17:49.091 dbexit:
Tue Jul 5 12:17:49.091 [initandlisten] shutdown: going to close listening sockets …
Tue Jul 5 12:17:49.092 [initandlisten] shutdown: going to flush diaglog …
Tue Jul 5 12:17:49.092 [initandlisten] shutdown: going to close sockets …
Tue Jul 5 12:17:49.092 [initandlisten] shutdown: waiting for fs preallocator …
Tue Jul 5 12:17:49.092 [initandlisten] shutdown: lock for final commit …
Tue Jul 5 12:17:49.092 [initandlisten] shutdown: final commit …
Tue Jul 5 12:17:49.092 [initandlisten] shutdown: closing all files …
Tue Jul 5 12:17:49.092 [initandlisten] closeAllFiles() finished
Tue Jul 5 12:17:49.092 dbexit: really exiting now

What is this? Thank you very much! What is the impact

ERROR: dbpath (/data/db/) does not exist.
Create this directory or give existing directory in –dbpath.

The reason is very clear.