How to upgrade rhel4 to rhel5 via yum

Tom <[email protected]>
Newsgroups gmane.linux.rpm.yum
Message-ID <[email protected]> 
Hi, All

     I have many server run on rhel4u7. I need upgrade them to rhel5. I want
to do it via yum.

     I have try it, failed. How can I upgrade rhel4 via yum?

     Thanks!

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