Hi Lee
There seem to be many people on the list who are eager to show off that they have "multiple mirrors" or have "multiple-gigabit" connections and other superlatives. Nevertheless they do contribute and deserve merit for the donation of something what at the end of the day rather turns out to be based on a 99$ unlimited "shared" bandwith rented server offering. And those are normally the same ones who ask in their second post to the list to be added to the ACL to mirror DVDs directly from the master servers as if binary data coming from one of the existing ones who made it in time to that ACL had less value.
What really counts for the project is a meshed content delivery network with fast connections and I personally find as much as possible peered local traffic instead of commercial transit traffic, however the peering situation is not a technical but only a commercial inconvenience. The "yum-fastesmirror" plugin now shipping as default has made the situation more sane because local mirrors are now preferred while before, data traffic was carried around the world by the questionable logic the CentOS team matches server and host IP through DNS.
What is strongly disliked are mirrors shaping the total bandwith on the port to a ridiculous amount of say 2-5 Mbit. This results in slow performance for the leechers from that server since the mirror accepts all request but delivers equally slow to all of them. Unfortunately yum only picks the next mirror on failure but doesn't failover in case of slow performance and cannot suck from multiple sources as bittorrent can. It is better not to have a mirror than having an extremely slow one. If you are not a carrier and you don't have to manage bandwith but purchase data volumes from someone who does, it's perfectly acceptable to allow downloads at wirespeed "as long as offer lasts" and completely stop the mirror when your volume is reached since other mirrors will take over the job thanks to the failover mechanism in yum. It's not a website where people look at and where your reputation suffers if it's down. Don't be shy about denying download requests at will, smarty yum, sitting on millions of machines to get fresh content for its host will pick the next mirror without complaint.
To make it short, if you want to contribute and you are serious about it, budget for a certain throughput not less than 10 Mbit and not more than some 30 Mbit and be creative by having Apache denying requests if the bandwith suddenly outreaches your budget.
My MRTGs are not public as of yet but realistic volumes for CentOS ONLY can be seen here:
http://mirror.silyus.net/ (German mirror, with DVD iso)
http://swissmirror.silyus.net/ (Swiss mirror, without DVD iso)
Expect volumes to double or triple for a couple days when a new release (5.1->5.2) comes out.
Regards, Florian
Von: centos-mirror-bounces@centos.org [mailto:centos-mirror-bounces@centos.org] Im Auftrag von Lee Clements Gesendet: Dienstag, 7. Oktober 2008 20:14 An: centos-mirror@centos.org Betreff: [CentOS-mirror] Average Monthly Transfer used?
Hey Everyone,
I'm a newbie to the list, not sure if this topic has been covered before but was about to establish a CentOS mirror to support what has helped me out tremendously in the last few months.
On Average, how much does a standard mirror pull per month in transfer?
Any help would be appreciated!
Thanks.
Lee Clements
Network Architect
ServerGurus
Direct: 312.376.8872
Main: 312.376.8870
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lee@servergurus.com
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