[CentOS-mirror] Proposal for a mirror hierarchy

[Keld Simonsen]

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