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Re: need some insight and direction

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: need some insight and direction
From: Jason Martin <jhmartin@xxxxxxxx>
Date: Mon, 14 Aug 2006 13:18:13 -0700
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On Mon, Aug 14, 2006 at 03:01:41PM -0400, cschoon@xxxxxxxxxx wrote:
> I am a consultant for a large law firm in Orlando, Fl. I have been 
> asked to do some research into Linux Clustering. to be specific, the 
> vision is to setup a linux cluster, run VMWare on the cluster, then 
> run Microsoft / Novell servers in VMWare.
> 
> If that is possible, then is it possible to add all 200+ workstations 
> to the cluster and run the desktop OS (Win XP / Win 98) on top of 
> that? Thus creating a cluster in the neighborhood of 243 nodes. 
Lets back up a second. 

VMware is a tool that allows you to run a set of virtual
machines on one physical machine. VMware ESX has the concept of
a 'cluster' whereby VMs will automatically migrate between
physical machines to balance load, or automatically reboot onto
a working node if the primary as failed. This feature requires
that all of the servers involved used a shared storage device.
For server applications, you could certainly run the servers
inside a VMWare VM.  

Assuming you had multiple VMs performing a given webhosting
task, you could use Linux LVS to balance the incoming traffic
across them.

However, Linux LVS doesn't have the concept of 'adding machines
to a cluster' in the same sense that a NUMA supercomputer can add
nodes and treat them as a single large image.  The physical
machines are still disparate.

I don't know that it makes any sense to have your desktops /
workstations run VMWare and then run Windows on top of it. It
would make more sense to have your desktops run  a cut down
Windows natively, then RDP into a VM running on dedicated VMWare
servers. 

Perhaps you could give us a better idea of what you are trying
to accomplish?
- -Jason Martin
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