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[K12OSN] Server Spec Question

We addressed the issue of a "separate app server per application" before, but I'm curious about how many clients a server can really handle. Here's my scenario:

LTSP Servers (One for OpenOffice, One for Mozilla, One for LTSP itself)
-Dual 3.2 Xeons with 2MB cache
-2x18 SCSI 320 drives in RAID 0 or 1 (whichever is mirrored, I forget)
-Dual GigE network cards

File Server (already existing, exporting nfs, samba, and netatalk):
-Single 2.0 Xeon
-3x36GB SCSI 320 in RAID 5
-Dual GigE (integrated)

Redundant Server for Emergency (also stores rsync backups):
-Single 2.4 Xeon
-2x18 SCSI 320 drives in RAID 0 or 1 (mirrored, I still don't remember)
-1x160GB IDE drive for rsync backup storage
-Dual integrated NICs

Windows 2003 Server (rdesktop for 60 clients):
-Dual 3.2 Xeons with 2MB cache
-3x18GB SCSI 320 drives in RAID 5 (integrated controller)
-Dual GigE network cards

Any Idea how well this will scale? My network will be Gig fiber backbone, with 100mbit switched at every port. I'm starting next year with about 75 thin clients booting to the setup, but would like to add more by adding some to classrooms. We have a total of around 65 classrooms, and although they won't all have 5 thin clients in them, a bunch will want these "mini-labs"

Does it make more sense to segment off the network, and have clients boot to specific servers? The Key Largo setup that I've heard so much about uses separate servers for separate apps -- and they scaled huge...

Anyway, I'm looking for some input, including input on the windows server, since that's my weakest ability as an IT guy. Oh, and read my disclaimer, so I don't get in trouble. ;)

Thanks much,

-- Shawn Powers Technology Director Inland Lakes Schools PHN: 231-238-6868 x9174 FAX: 509-356-7024 spowers inlandlakes org http://techcorner.inlandlakes.org

--<Disclaimer, now required for frustrating reasons>--
The views, opinions, visions, thoughts, comments,
sarcastic whims, forecasts, poetic outbursts,
cynical wit, future plans, implementation ideas,
OS preference, curricular insight, ice cream preference,
or anything else I might infer are not the
views of Inland Lakes Schools.  Pretty much everything
I say, do, think, or imply with punctuation should be
considered my own delusions, and ignored completely.

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