[CentOS-mirror] New mirror

[Bob Bownes]

The machines are in geographically separate locations.

The reason for round-robin is both load balance and for fail-over.

My guess is more folks than you think have crazy infrastructure. :) I've got
servers in 4 geographically separate locations for example.


On Fri, Oct 23, 2009 at 3:38 PM, J.H. <warthog9 at kernel.org> wrote:

> Speaking as someone who has machines in a round-robin (for a number of
> reasons) If the boxes are in the same place (same colo, etc) I would
> suggest daisy chain syncing.
>
> msync -> box 1 -> box 2
>
> it will mean that box2 will always lag, slightly, behind box 1 but it
> means less load on the upstream and I would doubt if your users are
> going to notice much.
>
> If you have disjoint machines (like I do), than having each one sync
> independently is the only real answer, though I can't imagine there are
> many mirrors who fall into my category of crazy infrastructure.
>
> What is the reason your doing round robin between the two?  Have you
> considered a shared storage solution if they are in the same place, I.E.
> sync to a "master" backend and push the changes to the two frontends?
>
> I guess to make good suggestions, comments, etc (beyond the incredibly
> generic things) we are going to need to know more about why you have
> this setup and what your trying to do / accomplish with it.
>
> - John 'Warthog9' Hawley
> Chief Kernel.org Administrator
>
> Nick Olsen wrote:
> > Well whats the point of the round robin? To distribute load between the
> > two boxes, and cover fail over?
> > To save bandwidth from everyone's point of view I think it would be
> > better to sync one from msync, and sync the other one from the first
> > one. What does everyone else think?
> >
> > On 10/23/2009 3:22 PM, Bob Bownes wrote:
> >> Dedup....indeed.
> >>
> >> So do I need to do anything special if I am going to have two machines
> >> (in disparate locations) on a round robin DNS answering to
> >> mirror.seiri.com <http://mirror.seiri.com> (and rsyncing from msync)
> >>
> >> I could sync one from the other, but that kinda defeats the round
> >> robin point.
> >>
> >> iii
> >>
> >>
> >>
> >>
> >> 2009/10/23 João Carlos Mendes Luís <jonny at jonny.eng.br
> >> <mailto:jonny at jonny.eng.br>>
> >>
> >>     That's why we really need block level deduplication, ASAP...   ;-)
> >>
> >>     Jeff Sheltren wrote:
> >>     > On Oct 23, 2009, at 10:22 AM, Nick Olsen wrote:
> >>     >
> >>     >
> >>     >> Never Thought of that....
> >>     >> I guess your right.
> >>     >> Don't really see why ISO's shouldn't be carried though.
> >>     >>
> >>     >
> >>     > Disk space.
> >>     >
> >>     > Some people (I won't name names, *cough* warthog *cough*) might
> >>     argue
> >>     > that having ISO images is simply a replication of the packages
> we're
> >>     > already carrying on the mirror and that there should be a better
> way
> >>     > to handle stuff so that mirrors don't end up with multiple copies
> of
> >>     > what is essentially the same data.
> >>     >
> >>     > -Jeff
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