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This posting is provided "AS IS" with no warranties, and confers no rights. The opinions expressed within are my own and should not be attributed to any other Individual, Company or the one I work for. I just happen to be a classic techie who is passionate about getting things to work as they should do (and are sometimes advertised and marketed as being able to?) and when I can I drop notes here to help others falling in to the same traps that I have fallen in to. If this has helped then please pass it on - if you feel that I have commented in error or disagree then please feel free to discuss with me either publically or privately? Cheers, Dave
Thin Clients, VDI and Linux integration from the front lines.... Raw and sometimes unedited notes based on my experiences with VMware, Thin Clients, Linux etc.

Yes you can, but would you want to?

This has come up again with an excellent post from Rene Vester at BrianMadden
A short guide to virtualizing Presentation and Terminal servers on VMware ESX 3

The main point about this is that it has always been a criteria of selecting suitable Guest systems to be hosted on ESX that they are relatively lightly loaded - otherwise what is the point of Virtualizing a Server - if you can't make some gains by way of consolidation then you are simply adding another layer to be managed?

If you have a Test Lab with Citrix Presentation Servers, then that's fine. If you have a Citrix Farm that is Silo'd out and you want to consolidate the Servers doing light duties then perhaps you should at least consider AIE, Thinstall or Softgrid to help eliminate the Silo partitions and get back to one Image?

And as far as I am aware the main issue with running Citrix PS on VMware's ESX has typically been around the Context Switching that really canes the VM Guest/Host combination - however I did hear (not seen in action) that this had been resolved with the later releases of 3.x

Anyway, for those that have the time and/or lab facilities to play with and want to test this, you might also want to check out these additional links?

VMware: Best practises for deploying Citrix on ESX
VMware Infrastructure 3 online Library
(Note: Searching for Citrix in the Library comes up with nothing... ;-)

UPDATE: Michel has added a very comprehensive list of 9 additional articles below

Category:Server Based Computing     Posted By Michel Roth     On Thursday 30 August 2007

Recently Rene Vester published an article at that talks about on what you should look out for when you are hosting Citrix or Terminal Servers in your ESX environments.

The subject of whether or not to host Citrix or Terminal Servers on VMware ESX environments and how to this has always been the subject of a healthy discussion. Rene mentions all the important tips you should be aware of when you do want to virtualize your Citrix or Terminal Servers on ESX. If I could add my own experience, I'd like to tell you that it is important to not hope to get hundreds of users on a box. Usually the maximum number of user sessions is around 20-25 concurrent users sessions on a single virtual Citrix or Terminal Server (using "small" virtual servers).

Besides the article Rene has written, there's also some other good references out there. Take a look at:

Best practices for deploying Citrix on ESX
Tuning list of Vincent Vlieghe's experience and the experience of several users on the VMware forum.

Improving Scalability for Citrix Presentation Server
Vmware white paper presenting data showing the number of Citrix sessions you can sustain when running Citrix Presentation Server 4.0 inside a virtual machine, and then measures scalability with 1, 2, 4 and 8 VMs. For ESX 3, engineering improved Citrix performance in a virtual machine and we want to showcase those gains, as well as present best practices for performance.

more at source...

Posted on Thursday, August 30, 2007 9:08 AM Citrix , VMware and other Virtualization tools | Back to top

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