Not sure about the RH E4. But the required partition size depends on the amount of software you select during installation time. The minimal installation requires about 700-800 MB, and the maximum can be installed comfortably inside a 10 GB partition. The partition size for my CentOS is about 5GB. I needed only about 4GB for the installation.
I guess a partition of 5-10GB should be enough for you.
Shane_Warne
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