One more thing -- if the bandwidth of the msync servers is the bottleneck, we could reduce their bandwidth requirements by serving the CR packages from public mirrors instead of mirror.centos.org. Most of the mirror.centos.org machines are also in the msync.centos.org rotation, thus they share the same bandwidth. I don't have statistics of the bandwidth consumed by CR. Someone who has access to such stats could see if this change would be worth implementing or not.