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- Improved Data Security - elimination of data islands.
- Standardization of desktop platforms and support by adoptingVirtual Desktop Infrastructure (VDI).
- Using thin-clientsto increase hardware life-cycle and reduce power costs and CO2 emissions.
- Simplify and facilitate campus-wide license arrangements andIT Service Management (ITSM) program.
- Remote desktop access.
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So here is the question: Is there anyone in this forum working on this or similar virtualization efforts and if so, what are your results, problems, observations, suggestions?
As a matter of fact my team does work on server virtualization analysis in general, and VDI is one of the workloads we do look at. I think one of the problems is the tremendous "variance" in usage models within this area. From doing graphics rendering on the server, to offloading it to the client, and from power users to "internet/email" users this is definitely not a one size fits all workload.
With that said, the point we are at now is trying to understand the workloads' [many] demands on the actual virtualized server, understanding the bottlenecks, processor needs, etc...
I will try to write a blog post about this in the near future.
For now though, I am curious about your personal experience with this workload if any?
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Tom, have you looked at: http://software.intel.com/en-us/articles/intel-energy-checker-sdk/?
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From the server's perspective, its "just" a workload, but is interesting because it can involve a very large number of VMs with relatively low levels of CPU utilization for each.
What I was trying to say was that my team focuses on studying the server side of VDI and understanding how it affects CPU, I/O, Memory, Caches, etc...
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My personal experience in setting up and using a virtual system is mainly with application software running on a server and users accessed the system using a web browser and Citrix through a VPN. The system supported several hundred simultaneous users.
The biggest bottleneck was the network itself. At locations that had a very high speed/capacity network infrastructure the screen update was almost as fast as working on the server itself. Where the network was not as robust the users constantly complained that anything they did took several seconds to respond. Aside from the network lag time there were few issues and using a virtual interface solved a great deal of administrative problems and reduced costs. The software only had to be installed and updated at one place. The installation of the software (an EPR/CRM) was complicated and required extensive customization and an Oracle client needed to be created and setup on a user's machine if the software was being run on it, which again added to the complexity. Also, many users owned Apple Macintosh laptops and the software was C++ WIN32 based and buying Windows and adding Apple Boot Camp or running a virtual machine was not a cost effective solution and would add to technical support loads.
Other added benefits were:
Enhanced security - users did not require a database password on the personal computer
Remote user access - schedules could be checked from home
Remote Technical support - a technician could run the system and see the problem first hand
I looked up the bandwidth consumed by XenDesktop and it varies greatly. An Office app will be about 43 kbps while hi-def video runs 1812 kbps. Source:http://community.citrix.com/display/ocb/2010/05/20/How+Much+Bandwidth+Do+I+Need+for+My+Virtual+Desktop
Printing takes up a large part of thebandwidth consumed (553-593 kbps) due to the data that has to be sent to the desktop machine. I would consider disabling any printing functions if possible. The network latency is usually not created by many users using the virtual desktop but by all of the other network traffic combined with it. Often the only solution to slow response times is to upgrade the entire network system when implementing a large virtual desktop solution.
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