redhat linux 6 / disk space at 100% after delete and reboot

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http://serverfault.com – Using df -h and du my disk space show 100% all the time. I have deleted at least 2GB of files and I rebooted the server. I thought that will fix the issue as the server came up just fine. However, it still shows disk space at 100%. Have anyone has this issue before? I have a tomcat and mysql running on both server. I have stopped those also. I have no idea what to do now? (HowTos)