In order to offer the right solutions to our Swiss customers, we often compare IT solutions with each other to gain an optimum view of the market and the products.
Here, for example, is a match-up between the terminal server and the VDI (Virtual Desktop Infrastructure), otherwise known as the virtual computer.
On the server side, several solutions coexist, the main ones being VMware, Microsoft and Citrix.
As far as Microsoft is concerned, since Windows Server 2012, Microsoft has offered two options:

  • Classic” terminal
  • VDI

The Classic terminal

The classic terminal has been used for many years by our customers, mostly to provide a remote working solution:

  • For mobile users
  • As a teleworking solution
  • To provide external access from a remote site (a subsidiary in a different geographical location, for example)

Another use of the Terminal is to deport workstation resources, in order to use the centralized resources of the Terminal server.
We have already implemented this solution for several of our customers, with the aim of limiting workstation costs.
One of these customers (a Geneva-based real-estate company) chose to replace its old PC fleet with thin clients.
In return, this customer had to invest in a much larger server infrastructure.
The operation proved to be profitable for the customer (as in most cases, the cost of the thin clients, well below the price of standard computers, offset the purchase of the server infrastructure).

VDI

Microsoft’s VDI solution replaces terminal “sessions” with independent virtual computers.
In other words, each user uses their own virtual computer, on which they can install their own applications, without interfering with the virtual computers of other users (which is not the case with the classic terminal).
This solution is a kind of cross between Hyper-V and Terminal.

Customer side

On the client side, access can be made from a wide variety of devices, running different operating systems:

  • Classic computer (PC, Mac, Linux, …)
  • Tablets and Smartphones
  • Thin clients

Classic” terminal VS VDI

Classic” terminal
TS server virtualization 100
Installing software affects all sessions 50
Fewer resources required per session 80
Can be used with a thin client 100
Separation of resources between users 20
VDI
TS server virtualization 0
Each machine is independent 50
More resources needed for VDI 10
Can be used with a thin client 100
Separation of resources between users 90
Centralization of “virtual” workstations 100

En termes de prix, le VDI sera plus coûteux que le Terminal Server.

Workstations VS light workstations

Workstations
High postage costs 20
No special infrastructure 90
More costly maintenance 20
Decentralized maintenance at each station 10
Less dependence on infrastructure 80
Light substations
Low substation price 80
No special infrastructure 90
Virtually no maintenance 90
Centralized virtual machine maintenance 90
More dependence on infra 10