Hi, I was sure this was already done but it seems not:

We are providing a full public mirror of scientific linux:

ftp://distrib-coffee.ipsl.jussieu.fr/pub/linux/scientific-linux/
http://distrib-coffee.ipsl.jussieu.fr/pub/linux/scientific-linux/
rsync://distrib-coffee.ipsl.jussieu.fr/pub/linux/scientific-linux/

All info about that mirror:

http://distrib-coffee.ipsl.jussieu.fr/

Regards.