On Mon, Nov 30, 2009 at 11:39:43AM +0900, Kazuhiro Fujieda wrote: > Dear CentOS mirror administrators, > > There are many mirrors, but few mirrors provides DVD images. > I believe most of all mirrors have enough resources to provide > DVD images. You always say the master can't provide DVD images > for all mirrors without enough resources. > > I suggest introducing mirror hierarchy as follows to solve this > problem. > > Administrators of servers with enough facilities stand as > candidates of sub-master server. You may chose at most two or > three servers in one country, and allow only sub-masters to > access the bunch of master servers. In this case, All masters > should provide DVD ISO images. > > In my humble estimation, sub-masters should have at least 500 > Mbps of effective bandwidth dedicated to CentOS. They should > also provide rsync service able to have more than 20 > simultaneous connections. The word `effective' means sub-masters > should transfer more than 5 Tbytes per day only for CentOS. > > As for our server, it can easily satisfy these criteria. > > Sub-masters may synchronize with the master each hour. Other > mirrors may synchronize with the sub-masters 2-4 times per day. > > Sub-masters should properly share the rsync ACL with the masters > to distribute new releases secretly in advance. Could you tell what is the parameters for your site? Especially, how many rsyncs do you allow simultaneously? I believe you have a 10 Gbit/s connection. best regards keld