[Server-devel] CCCS XS deployment

Gerald Ardito gmanb5 at gmail.com
Tue Oct 13 10:56:24 EDT 2009


I have been trying to do the same thing as you, with little success, so
would appreciate any tips you have or maybe a phone call to walk me through.
Please let me know what works for you.


On Tue, Oct 13, 2009 at 9:37 AM, Josh Totoro <jtotoro at chartersmi.com> wrote:

> Thanks for the Info, but we ended up going a different direction.
> We segregated the wireless networks for each building into different VLAN's
> and created a unique SSID for each building, we then made the XS the gateway
> to our main network for each VLAN.  This limited the number of users per XS
> to 350 total and more like 100 concurrent.  So far it seems to be working.
>  The kids only see other kids from their own building but that was fine by
> us since there are different grades in each building.
> FYI we are running this XO network on our Procurve Wireless Edge Service
> module and it has been working like a charm.  I didn't know if you knew
> anyone else who has tested this system so I thought I would let you know.
> Thanks for the help
> -----Original Message-----
> From: Martin Langhoff [mailto:martin.langhoff at gmail.com]
> Sent: Monday, October 12, 2009 3:47 AM
> To: jvonau at shaw.ca
> Cc: Josh Totoro; server-devel at lists.laptop.org
> Subject: Re: [Server-devel] CCCS XS deployment
> On Mon, Oct 12, 2009 at 2:50 AM, Jerry Vonau <jvonau at shaw.ca> wrote:
> >> When I set up the first XS server back in march (0.5.1) there was a
> >> lot more info on the Wiki about setting up multiple XS servers in one
> >> network.  Does anyone have any of this info available still or does it
> >> no longer apply?
> I removed the info because we don't really support multiple XS servers
> in one network. That model is old, from the days when we thought we
> would strongly recommend active antennas.
> If you have a really large school, the model is:
>  - Build a network with many APs, all connected to a "network
> backbone" (one or more switches). The network backbone must connect to
> eth1 on the XS.
>  - Only one XS. If you have many users, just aim for a high-spec
> machine for the XS role.
>  - If the traffic is too much even for the high-spec machine you have
> as XS , you can setup machines for specific roles -- this will need
> minor changes in the config of the main XS. For example:
>   - If postgresql load is significant (mainly in disk IO, memory),
> the pgsql-xs process can be moved to a different machine -- just a
> vanilla Fedora server running postgresql.
>   - If the http proxy load is significant (disk IO, memory), the
> squid process can be moved to a separate machine.
>   - If the Moodle (apache/php, affecting memory and cpu) load is
> significant, move it to a separate machine.
> Now... the heaviest load on the XS will be Moodle (Apache / PHP /
> PostgreSQL); and I have a lot of experience with large scale moodle
> installs for up to 120K users, with "concurrent" use peaking at a
> couple of thousand. There the answer was a small cluster of x86
> mid-range servers.
> The very largest schools we are targetting for OLPC deployments have
> have around 3K users. At most you'll see 500~800 concurrent users(*)
> and that will probably melt the network before it even gets to the
> server.
> And any mid-range server of the current generation (multi-core, maybe
> 8GB RAM using PAE, some reasonably fast SATA disks) will handle that
> and laugh in your face while it cooks some pasta for your dining
> pleasure.
> * Not concurrently connected, but requesting a page within the same 5s
> window.
> cheers,
> m
> --
>  martin.langhoff at gmail.com
>  martin at laptop.org -- School Server Architect
>  - ask interesting questions
>  - don't get distracted with shiny stuff  - working code first
>  - http://wiki.laptop.org/go/User:Martinlanghoff
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