So LTSP memory/processing requirements can vary widely depending on your
environment and what your users are doing with it. I get that. But I was
wondering if someone really had a finer sense on what the requirements are for
the following situation.
A virtual machine running Ubuntu 14.04 LTS and ltsp-server and dhcp on VMware
Server with hardware thin-clients booting to it. The LTSP server virtual
machine has two NICs. One for the network we image it with and the 2nd being
the thin-client network that dishes out the ip addresses. I have the default
gateway set to the NIC that's public facing, so in theory all thin-client
sessions are getting their network traffic through that NIC.
What should I set for the specs on this LTSP server VM for X number of thin
clients? Same as the hardware requirements listed in the LTSP Installation
Guide? Users should only be web browsing, document editing, they may play some
audio, basic every day stuff. How will this saturate the virtual NIC?
I have maybe 100 concurrent users so clearly I need either.....
1. Multiple LTSP servers running across multiple VM's in VMware. I separate
thin clients in dhcp so that only one LTSP server answers them on boot. Thus
dividing the users among VMs. But how much does this tax the VMware Server host
machine?
2. Have one LTSP VM server in Vmware and make it HUGE, basically one of the
only few VMs on the host. Possibly purchase a VMware host machine just to run
one or two or three LTSP servers that have really beefy settings. How will the
network traffic perform?
3. Given option two, having a large LTSP server run as a VM for many users
doesn't really buy me much if I have to have such a beefy VMware host. Might as
well just stick with hardware/bare metal machine for my LTSP server with no
virtualization.
It's all a question of scaling but gets complicated when considering
virtualization.
I think it comes down to which is a better scheduler? VMware or Ubuntu? If
VMware better utilizes the host resources for the LTSP Server VM and the strain
the clients put on it, then sure, maybe we'll dedicate one of our VMware hosts
just to this task. But if Ubuntu is a better resource scheduler than VMware
then might as well just stick with installing Ubuntu directly on the machine
and skip any virtualization.
Thoughts? Am I nuts? Who else is doing this and what have you found? It's hard
to test with 4 concurrent sessions right now.
--mike
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