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



Huck-
Have you looked at putting multiple gig-e cards in the server? You may need to break things into multiple subnets for it to work (or perhaps not). There was some discussion on the list a couple years ago about using multiple NICs in the server, but I don't recall what the consensus was.

Petre

Huck wrote:
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 leopards k12 ar us
Tux for President!

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