[root@mongodb ~]# du -sh /var/lib/mongo/*
65M     /var/lib/mongo/admin.0
16M     /var/lib/mongo/admin.ns
165M    /var/lib/mongo/journal
65M     /var/lib/mongo/local.0
16M     /var/lib/mongo/local.ns
4.0K    /var/lib/mongo/mongod.lock
65M     /var/lib/mongo/noc.0
129M    /var/lib/mongo/noc.1
2.0G    /var/lib/mongo/noc.10
2.0G    /var/lib/mongo/noc.11
2.0G    /var/lib/mongo/noc.12
2.0G    /var/lib/mongo/noc.13
2.0G    /var/lib/mongo/noc.14
2.0G    /var/lib/mongo/noc.15
2.0G    /var/lib/mongo/noc.16
2.0G    /var/lib/mongo/noc.17
2.0G    /var/lib/mongo/noc.18
2.0G    /var/lib/mongo/noc.19
257M    /var/lib/mongo/noc.2
2.0G    /var/lib/mongo/noc.20
2.0G    /var/lib/mongo/noc.21
2.0G    /var/lib/mongo/noc.22
658M    /var/lib/mongo/noc.23
1.1G    /var/lib/mongo/noc.24
512M    /var/lib/mongo/noc.3
1.1G    /var/lib/mongo/noc.4
2.0G    /var/lib/mongo/noc.5
2.0G    /var/lib/mongo/noc.6
2.0G    /var/lib/mongo/noc.7
2.0G    /var/lib/mongo/noc.8
2.0G    /var/lib/mongo/noc.9
16M     /var/lib/mongo/noc.ns