Multi-zone vs single-zone: which should I choose

If I have a fleet of about 500 linux devices to manage spread accross 7 main sites should I create a single zone or a zone for each site?
Sites are connected by reliable high-speed WAN links but I dont want every client in every site pulling down updates over the WAN.
If I put a secondary server at each site and replicate content but keep a single zone do the clients have some way of knowing which is their local server? I'm unable to find any documentation on how a client chooses a server when there is more than one.
regards
Randall

Brundold/
Thanks for the responses..
Originally Posted by brunold
Randall,
I would choose a single zone because I would have all managed systems within the same system. You need to mirror down the updates just once and can use that bundle on all managed devices. So no need to copy that bundle to a second, third, fourth ... server to make sure they have the exact same packages in and so on. You need to do the job always only once and can use it on all the other systems. Also reports, policies, bundles ... they always need to be created just once ...
I have not seen a installation with 7 zlm server. We just have one primary and one secondary. Seven might be very high.
Do you have some locations where are less managed devices then on the other that you can reduce the number of zlm server ?
Of the 500 maybe 300 are at one location but unfortunately the remaining 200 are pretty evenly spread accross the other locations. Whilst a secondary server in every remote office is clearly overkill we want to avoid having 30 copies of each RPM being downloaded over the WAN. Is it possible to somehow proxy workstation updates from a server to a client? That would be a neat solution..
Originally Posted by brunold
But there are a few things you need to take care of:
1. whereas you can have more then just one zlm server, the data store (postgresql or oracle) is a single instance. All zlm server must access this database. So you need to make sure that is high available. Maybe having the database in a heartbeat / drbd mirror to a second location ? If that database is not accessible from a zlm server, it cannot distribute software !
Servers are likely to like on a VM cluster with HA so that shouldnt be an issue.
Originally Posted by brunold
This could be a very interesting project.
What software do you primarily distribute using zlm ?
OS updates or other software packages as well ?
Rainer
The priorities for deploying such a system (be it ZLM or something else) are
1. Inventory & Asset tracking/management
2. OS updates
3. A small and relatively static suite of in-house software

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