The following hardware configuration is required for the RHN Proxy Server:
Dell PowerEdge 1750 or equivalent
512 MB of memory
3 GB storage for base install of Red Hat Enterprise Linux AS
1.5 GB storage for source packages and updates
Keep in mind, the frequency in which client systems connect to the Proxy is directly related to load on the Apache HTTP Server. If you do reduce the default interval of four hours (or 240 minutes), as set in the /etc/sysconfig/rhn/rhnsd configuration file of the client systems, you will increase the load on this component significantly.