I read this not too long ago.  Not exactly what you're
asking for, but it may help.

  http://eltoday.com/article.php3?ltsn=2001-07-23-001-14-PS

Jim

Ragnar Wisløff wrote:
> 
> Hi,
> 
> I've not found any hard figures for what the sensible sizing of an ltsp based
> network should be. Linux' good use of buffers and cache makes it difficult to
> evaluate on a little network how the thing will scale. I've been trying out
> three X-terminals against a box with 384 MB RAM, and that certainly is no
> problem, running KDE 2.2 and KOffice as main apps. But looking at a real
> environment with perhaps 50 terminals (our local primary school) - how does
> one size the server(s)? I assume RAM is the most important - is that correct?
> What comes next - disk i/o speed or cpu speed?
> 
> Another element is the strategy for scaling the infrastructure. With 50
> terminals and 350 users, say 50 MB each of quota room the disc size isn't all
> that big. Should one go for a single NFS home directory server exporting to
> the app servers or local disks? A central NFS server would give more
> redundancy by allowing the terminals to connect to different app servers
> according to load, but then everything hinges on that one server. Any
> experiences with this?
> 
> Any other real world experiences from users of medium size ltsp installations?
> 
> --
> Ragnar Wisløff
> ----------
> life is a reach. then you gybe
> 
> _____________________________________________________________________
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