[K12OSN] Servers, K12LTSP, and workstation numbers, etc.

Huck dhuckaby at paasda.org
Mon Jul 24 15:41:21 UTC 2006


Doug,

your bottleneck on that is going to happen at the network level more 
likely...I have dual Xeon 3.0ghz with 4 gig of ram...
with 35 terminals all going at the same time...it gets slow on a gig-e 
backbone...(with less than 40% CPU usage and has never touched swap file 
  for memory as far as I can tell when monitoring with 'top')

Perhaps I'm doing something wrong, but the math seems correct..

35*75(approximately) == around to 2 gigs of used bandwidth.
perhaps there is some method of load balancing I can use that I haven't 
tried yet...(an application server, 2 k12ltsp servers...)

I am sure 'scalability' is a larger issue with public schools and 
districts...luckily we're a small 1 site school with only about 230 
students and the LTSP network is merely to augment the Mac and PC labs.

--Huck
Doug Simpson wrote:
> Hello.
> 
> I finally have got my Superintendent excited about being able to use older 
> hardware to save monty and use K12LTSP for thos older computers to make 
> them usable again in Internet/Research/Writing labs in our schools.
> 
> I have several servers that have K12LTSP installed and ready to go, 
> thinking I could run many workstations from them.
> 
> But when I read articles that say a district has 32 servers to deploy 
> K12LTSP, I am thninking I am missing something because where is the cost 
> savings in that, forst of all, and that means server updates and 
> everything will have to be done on all those servers.
> 
> Our Supt. is a "Bottom Dollar" kind of guy and he doesn't look at TCO so 
> much as what it will cost to "get it in the door".
> 
> Say I have a server with 12GB RAM, Almost a terabyte (sp?) of SCSI hard 
> drive in Raid5 and Gigabit NICs.  Realistically, how many workstations can 
> I hang off there using Gnome, Mozilla, OOo, and several other apps on 
> intermittent basis and see usable performance?
> 
> Also, I have one server, running FC1 with K12LTSP and it serves DHCP IP 
> addresses, but I want another server to handle the terminals.
> 
> I added the next-server line to dhcpd.conf, but it still looks to the FC1 
> server to boot from. The other (preferred server) is FC3, K12LTSP and I 
> think it is set up correctly.
> 
> What can I look for to make the workstations boot and run from the FC3 
> server with DHCP being handled by the FC1 server?
> 
> Thanks!
> 
> Doug Simpson
> Technology Specialist
> DeQueen Public Schools
> DeQueen, AR 71832
> simpsond at leopards.k12.ar.us
> Tux for President!
> 
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