On Tue, 27 Jan 2004, Nitin Putcha wrote:
> Does anyone here have experience deploying an LTSP solution (over
> Debian/Knoppix) for a large number of clients? We are evaluating LTSP for
> our entire university, and may have over 100 users (with maybe 50
> concurrent users), and that�s just phase 1. Phase 2 will be 100 more. My
> LTSP deplyment vendor is recommending just one large server with 4 gigs of
> RAM. My thumb rule is 50-64mb RAM per client. Anyone care to detail their
> experiences?
>
> Specifically:
> -One or more servers? How to run 2+ LTSP servers if the DHCP ports will
> conflict? Can each server use a diff. set of ports? Client config for 2+
> servers?
> -If file services are run off a separate server, do I need a live backup
> for the LTSP server? An hour of downtime wont hurt, but a half-day's
> downtime will.
> -USB pen drive storage on the client?
> -CD-ROM drive on the client? CD-writing?
>
Nitin,
partial answer based on my experience:
1. 1 server is better than many, but 4GB is not enough. i'd look to amd
64bit processors and *big* memory. i run rh9 with gnome desktop, mozilla,
oo, evolution and gnome terminal to connect to business system. the 4GB
servers are good for 35 users - ver, very good response time. the
deteriorate quickly when more users log in.
2. multiple servers - look into running specific apps on separate servers.
nis is fine, but you can just rsync the users files in /etc. nfs mount the
home dirs and use ssh or rsh to access the apps. another way is to steer
the users to specific servers through entries in lts.conf. don't worry too
much about dhcp redundancy - couple hundred stations present negligible
load.
3. your home dirs should be on a good scsi array that can be easily moved
to another server. build a cheap array for backups
4 usb on client - there was a description of how to achieve it on this
list.
5. cd - supposedly possible, but no clean implementation in sight.
that's my experience, ymmv. julius
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