[CentOS-mirror] Obsolete DVD ISOs in CentOS mirrors

I help maintain a private mirror for my company. I recently found out that our mirror is still carrying CentOS DVD ISOs for 5.3 and 5.4. I deleted them, and my next rsync (from mirrors.kernel.org) brought them back.

I sampled a few of the other tier-1 mirrors (constraints: providing DVDs and RSYNC access, and first few on the mirror list) and found that: * mirrors.kernel.org has 5.3 & 5.4 DVD isos. * mirror.ncsa.illinois.edu has 5.3 and 5.4 DVD isos. * mirror.steadfast.net has 5.3 and 5.4 DVD isos * centos.mirror.netriplex.com has 5.3 and 5.4 DVD isos

Is there any reason to still keep these around? Can they be deleted from tehse mirrors (or the master mirrors) or should I modify my rsync scripts locally?

Thanks, Kelvin