[THIN] Re: VMWare and Citrix?

  • From: "Braebaum, Neil" <neil.braebaum@xxxxxxxxxxxxxxxxxxxxxxxx>
  • To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
  • Date: Tue, 21 Jan 2003 09:43:42 -0000

> -----Original Message-----
> From: Carl Stalhood [mailto:cstalhood@xxxxxxxxxxxxx] 
> Sent: 20 January 2003 19:03
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: VMWare and Citrix?
> What about VMWare ESX Server?  It does not require a host 
> operating system.  For large Intel servers (8-way or higher), 
> they mention that you could get more users on several virtual 
> servers running on the one box rather than one Terminal 
> Server running on the one box.

Yup, that sort of stands to reason.

However, as I've mentioned in another off-list reply, how this balances with
comparisons with individual servers of the same spec, will vary.

Much will depend on the architecture of the "big" server. Remember you will
(probably) still share some common resources, bus(es), controllers, disk
subsystems, network.

And you have to factor in the resilience of the host components.

> Check out the IBM presentations from iForum 2002 for more 
> information on their performance testing.  According to 
> IBM.ppt, Heavy users on an 8-way equal 175 when using the 
> CSTK for testing (I'm guessing Win2k Advanced Server).  The 
> same hardware with VMWare virtual servers tested with 307 heavy users.

I guess the question is, how does this compare with the equivalent in
individual servers.

Don't get me wrong, I'm a user of VMware, and Datacenter. However, I
perceive quite narrow *current* circumstances where it would be the ideal.
However, given existing large scale architecture, and how best to use it
from a physical server consolidation perspective, VMware is an attractive

I think it does bear note, though, that you do carefully have to analyse
which is going to be the best use of such tools, on an application (or OS
use) perspective.



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