Daniel Veillard said:
Edit /etc/sysconfig/rhn/up2date , change
storageDir[comment]=Where to store packages and other data when they are retrieved storageDir=/your_NFS_storage/var/spool/up2date
and
keepAfterInstall[comment]=Keep packages on disk after installation keepAfterInstall=1
There is a risk associated in the sense that there is no synchronization of the downloads, and I don't know what would happen if machine A and machine B try to download the same RPM at the same time, but the worse which can happen is a corrupted package which will be detected by the MD5 checksum check of rpm, will be reported and manual intervention can then clean it up.
Daniel
Another option would be to just wget a mirror then use the "-k" option to have up2date copy the files from your mirror. That way if you don't have the file each machine can download it from RH without causing issues.