# tail -f mongod.log
2016-04-26T14:43:59.631+0000 I STORAGE  [FileAllocator] allocating new datafile /data/work/mongodb/data/opWNFbyNlGQ6xShT.11, filling with zeroes...
2016-04-26T14:43:59.632+0000 I STORAGE  [FileAllocator] FileAllocator: posix_fallocate failed: errno:28 No space left on device falling back
2016-04-26T14:43:59.632+0000 I STORAGE  [FileAllocator] error: failed to allocate new file: /data/work/mongodb/data/opWNFbyNlGQ6xShT.11 size: 2146435072 failure creating new datafile; lseek failed for fd 40 with errno: errno:2 No s^C

/dev/vdh                            16G   15G  553M  97% /data/a6a186a3-dc98-4f47-83f3-96e953c18b69

> db.runCommand( { repairDatabase: 1 } );
{
        "ok" : 0,
        "errmsg" : "Cannot repair database opWNFbyNlGQ6xShT having size: 14975762432 (bytes) because free disk space is: 578928640 (bytes)",
        "code" : 14031
}

> db.runCommand ( { compact: 'accounts', paddingFactor: 1.1 } )
{ "ok" : 1 }

> db.currentOp()
{ "inprog" : [ ] }
> db.currentOp()
{ "inprog" : [ ] }
> db.currentOp()
{ "inprog" : [ ] }