July 15, 2011, 1:44 PM — If two technology trends were ever made for each other, at least in vendor marketing materials and generically simple diagrams of IT infrastructure, they are the consumerization of IT and desktop virtualization.
Analysts who study desktop virtualization say many of its use cases fit neatly into problem areas that their client companies face, such as the consumerization of IT. End users who insist on using non-standard or unapproved computing devices, such as tablets and iOS or Android smartphones, make demands on the IT department, the remote-access infrastructure and the IT budget, according to Ian Song, research analyst at IDC. When the same user wants to use two, three or four computing devices for different reasons, the situation can quickly get out of hand.
"You're not going to give everyone two or three computers or try to set up your applications and infrastructure to support every device everywhere, no matter what your resources," Song says.
The clearest solution is to create a virtual desktop that runs on a server in the data center but that can be launched, viewed and used as easily by an end user in the office at a traditional computer as by a worker logging in from a PC in a public kiosk or smartphone connecting via open WiFi.
That setup--full-blown virtual desktop infrastructure (VDI) implementations--is becoming far more common but will probably never make up the majority of virtual desktops, let alone outnumber traditional physical desktops, according to Chris Wolf, a research vice president at Gartner.
It's by far the most expensive form of virtual desktop--especially compared to streamed or Web-based applications that can be used from tablets, smartphones and other traditional devices that support VPNs or other encrypted connections, Wolf says.
"People tend to talk about desktop virtualization as if it's one solution, or even a set of solutions, but there has always been a range of implementations," he says.
Traditionally, virtual desktops consisted of dumb-terminal, shared-server/shared application setups used in call centers, banks and other transaction-heavy environments in which employees work in shifts and several may use the same machine on the same day.
That's still the most popular implementation, and the least expensive. Other implementations let IT match the functions required by the user with the complexity and cost IT can afford, Wolf says.
Some users might stream to the desktop one application they use only occasionally; others may be set up to choose several applications to be streamed from an internal corporate "app store" or even work full-time on a "desktop" that is actually a virtual machine running on a data-center server--which requires the resource-intensive VDI server setup.
"A certain percentage of people--maybe 20 percent--will be appropriate for full VDI, where most others will use either mostly streaming apps or stream the apps and OS onto their own laptops, and some will just have traditional installed apps."
It's not hard to put a Web front end on an application and make it available through an internal server to users on a range of client hardware, but thats not the most secure or manageable arrangement, according to James Staten, vice president and principal analyst at Forrester Research.
Applications are more secure and easier to control and support if IT is able to put a hypervisor on every device an end user wants to use, Staten says. Not every device needs a hypervisor designed expressly for its hardware or operating system--which Citrix sells and VMware is developing--but native hypervisors perform at much higher levels than those installed later, no matter which vendor makes them.
Not only is the connection more secure than streamed apps or SSL, the hypervisor lets IT create a whole environment in which it can apply the same security, applications and policies it does on a company-owned computer that never leaves the building.
"That makes it a lot easier to enforce policies on anti-virus and security updates and keeps anything you might install on the 'home' part of a device from sneaking over into the 'work' section and corrupting drivers or transmitting a virus," Song says. "Just because of the number of end users and client devices, there's a real scale issue especially compared to virtual servers."
Trying to scale virtual infrastructures to keep up with virtualized, consumerized hardware is a nightmare for IT operations people, who are often already struggling to move past the barriers and plateaus many companies hit during large-scale physical-to-virtual server migrations, Staten says.
