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





On 7/25/06, Doug Simpson <simpsond leopards k12 ar us> wrote:
25 clients per server. . . we'd need about 40 servers. . .They'd never go
for that. . . I was hoping to be able to serve hundreds per server. . .


If you are going to have hundreds on at the same time running Firefox and OOo on 1 server (maybe the entire school):


Go Opteron.
A single 2.0 Ghz Opteron can handle about 25 clients. That's about 80 Mhz / client (BTW Xeons require about 100Mhz/client). If  you get a dual Opteron MB that supports dual-core cpu's you can put 4 cores it ( two Opteron 270's ) That should be able to support 100 clients simultaneously provided you have about 80mb ram / client and use Icewm. So you will need 8G ram. Make sure you have 15K rpm SCSI drives in Raid 1 or 5 with an LSI or 3ware controller (preferably with it's own cache) and of course a Gigabit NIC on eth0. The quad cpu motherboards and 800 series Opterons are *VERY* expensive.

 

Not a good deal, but. . .

Doug Simpson
Technology Specialist
DeQueen Public Schools
DeQueen, AR 71832
simpsond leopards k12 ar us
Tux for President!

On Mon, 24 Jul 2006, James P. Kinney III wrote:

> It really boils down to networking at the Enterprise model level. Tests
> have show that a 1Gb data line can support 25 clients.
>
> RAM is still king as each client will need 50-75 MB of RAM.
>
> We had about 56 clients hanging from a dual Opteron (single core) server
> w/4GB RAM and dual, bonded Gb NICs. The load level was getting heavy but
> OK until firefox got loaded. At that point, swap got hit and the box
> thrashed itself into oblivion. A hard reboot later (and turning OFF
> swap) and it _could_ run 56 clients but it was dragging.
>
> So for the "Bottom dollar" person: a single chip, dual core w/ 2GB RAM
> and 2 NICs (one Gb for clients, the other 100Mb for Internet) and a
> 120GB hard drive will serve 25+ clients very well. This a good model for
> an "app server".
>
> On Mon, 2006-07-24 at 10:15 -0500, 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!
> >
> > _______________________________________________
> > K12OSN mailing list
> > K12OSN redhat com
> > https://www.redhat.com/mailman/listinfo/k12osn
> > For more info see < http://www.k12os.org>
> --
> James P. Kinney III          \Changing the mobile computing world/
> CEO & Director of Engineering \          one Linux user         /
> Local Net Solutions,LLC        \           at a time.          /
> 770-493-8244                    \.___________________________./
> http://www.localnetsolutions.com
>
> GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
> <jkinney localnetsolutions com>
> Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
>

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--
Robert Arkiletian
Eric Hamber Secondary, Vancouver, Canada
Fl_TeacherTool http://www3.telus.net/public/robark/Fl_TeacherTool/
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