roll back yum udate

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http://www.linuxquestions.org – Hi guys, thanks for your help. I recently updated my rhel6.4 to rhel6.5 using yum. About 385 packages where updated. However, the server is not working properly. User logins take forever and reboot command hangs the server. How can I roll back this update? In solaris, I will just activate the old boot environment. Does Linux have anything to roll back and update? Thanks to you all. (HowTos)