[CentOS-devel] Getting there faster

Bryan Seitz seitz at bsd-unix.net
Sun Nov 10 10:12:22 UTC 2013


On Sun, Nov 10, 2013 at 09:19:45AM +0000, Nux! wrote:
> On 10.11.2013 06:46, Brian Mathis wrote:
> 
> > Bandwidth limiting could probably be accomplished using 'tc', 
> > otherwise the
> > "bwlimit" option to rsync might work well enough for a simulation.  
> > Looks
> > like 'tc' can help with latency too (
> > http://stackoverflow.com/questions/614795/simulate-delayed-and-dropped-packets-on-linux
> > ).
> > 
> > What kind of control do you have over the mirrors?  One option is to 
> > reduce
> > the amount of data that needs to be transferred.  This could be
> > accomplished by:
> > a) Transferring only package files to mirrors, then running scripts to
> > build the ISOs in place
> > or
> > b) Transferring only the ISOs, mounting them through loopback, then
> > building the repos with symlinks into the mounted ISOs.
> > 
> > I am assuming that the packages in the repos are identical to those on 
> > the
> > ISOs, so there's already a bunch of duplicate data getting sent over.
> 
> This might not work, many mirrors do not carry all or any ISOs.
> I still think bittorrent/btsync/similar between the primary mirrors or 
> a select number of mirrors that agree to this should work fine.
> 
> Related read: 
> https://blog.twitter.com/2010/murder-fast-datacenter-code-deploys-using-bittorrent

I was purely talking about the centos infra mirrors btw, external mirrors are still a wildcard and
under their owners control.

-- 
             
Bryan G. Seitz


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