I asked a similar question a few weeks back. Karanbi commented that there are plans to move to MirrorManager which provides very cool features and smarter logic in the load balancing of mirrors.  Some of the other projects we mirror utilise MirrorManager and the abilities of them are very cool.

Guess we just have to wait and see.

- Seamus

From: centos-mirror-bounces@centos.org [mailto:centos-mirror-bounces@centos.org] On Behalf Of Christopher Meng
Sent: Monday, 27 August 2012 9:35 AM
To: Mailing list for CentOS mirrors.
Subject: Re: [CentOS-mirror] Question about Mirror load Ddistribution

Does CentOS project have any plan to add a load balancing function by using some software?(Sorry I don't know which has this function)

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Yours sincerely,
Christopher Meng

Ambassador/Contributor of Fedora Project and many others.
http://cicku.me