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Originally Posted by packets
Distro is CentOs 6 and CentOS 7 is out already. I am already thinking to do fresh install and just migrate data.
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That is the best way to go, in my opinion, ALWAYS. I've had too many issues with old bits of things hanging around after an in-place upgrade, that have caused issues later. A wipe/reload (in my opinion), usually yields better results.
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Is just that the risk is high and a bit tedious :-)
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...and welcome to your job as a systems administrator. This is where your knowledge and training come in to play.
If you're getting a new server, get new hard drives too. Do your install/migration there, and test things...leave your old server in place as a fall-back in case there are issues. When you're done, and have verified that everything is working on the new box, format/reload the old server, and tuck that hard drive away.