keep in mind that the legacy hardware / software Operating system RHEL5
is well old
and 5.3 is even older and UNPATCHED!!!!!!
you would not run Microsoft XP sp2 nor sp3 missing 3 YEARS!!!!! of security updates
so please NO NOT DO THAT WITH A LINUX INSTALL
run the current UP TO DATE and PATCHED!!!!!
old legacy support RHEL 5.11
mind you you HAVE to buy the required server support contract
a std 1 year server license is $799 per year
https://www.redhat.com/wapps/store/catalog.html
or
install the FREE!!! clone of redhat
CentOS 5.11 - for the RATHER OLD legacy support
CentOS 6.7 current mainstream
or
CentOS 7.1 current new os