Take a look at this!

[root@dyn89 yum]# pwd
/var/cache/yum
[root@dyn89 yum]# du -sh *
1.8M atrpms
6.1M core
5.3M development
11M extras
36K flash
84K jpackage-fedora
2.2M jpackage-generic
192K jpackage-generic-nonfree
848K livna
2.8M updates
176K updates-sourceThat’s 30Mb of crappy yum cache

Now take a look at this:

[root@dyn89 cache]# yum clean all
Loading "installonlyn" plugin
Cleaning up Everything
[root@dyn89 cache]# du -sh * 1.8M atrpms
12K core
5.3M development
12K extras
12K flash
84K jpackage-fedora
2.2M jpackage-generic
192K jpackage-generic-nonfree
12K livna
12K updates
176K updates-source9.6M much healthier