Microsoft licenses Vista for 'diskless' PCs

Microsoft is loosening the reins on Vista licensing in an effort to let businesses try out some new computing possibilities, including "diskless" PCs.

For the most part, the Windows licensing terms have assumed that the whole PC is going to be in one place; however, increasingly, that's not necessarily the case.

Virtualisation technology means that one physical computer can act as many separate computers, while higher-speed networks mean that different parts of a computer can actually be housed in various locales. For example, it is now possible to have a diskless PC, in which the main hard drive of the computer is actually stored in a datacentre, while all the other parts -- processor, graphics chip and memory -- remain at a worker's desk.

But until Sunday, there was no proper way to license Windows for such a computer. Under new licensing terms for Windows Vista Enterprise, businesses will be able to use the corporate edition of the operating system to handle this as well as other niche cases in which a PC's storage, computational power or both are handled somewhere other than the desktop.

"We're responding to enable a set of early adopters in finance and governments, in particular, to take advantage of architectures that centralise Windows," said Scott Woodgate, director of Windows Business Group. "They either centralise the storage of Windows, the execution of Windows, or both, in the datacentre."

In addition to the diskless PC, the other arrangement Microsoft is giving the nod to is one in which a desktop PC or thin client is running multiple virtual machines that are running on a server. The Vista Enterprise license already provides a license for additional Windows virtual machines, but only those running on a desktop PC, not for ones taking place on a server. The new approach, called Vista Enterprise Centralized Desktop, requires an additional annual fee.

Although Microsoft is making such set-ups legally permissible, it doubts diskless PCs will become an overnight trend. There are many negatives, most importantly the need for a constant and uninterrupted high-speed network connection. If the network goes down, the whole PC becomes unusable. Also, while Microsoft is making diskless PCs commercially possible, enterprises will still needed additional third-party software to actually make such systems boot up.

Because of the technical limitations and the massive IT resources needed to manage such an operation, Microsoft expects only a small number of institutions to try out such a set-up, most likely top-secret government agencies where security concerns trump the inconveniences.

"If you are in a department that is a three-letter department you may want to keep that hard drive away," Woodgate said, likely making reference to places like the CIA or FBI. "It's relatively a niche."

Even in those cases, Microsoft says it will take time to get the systems up and running. "It will be interesting to see, 18 to 24 months after those early adopters have taken the systems into production, how successful they are," Woodgate said.

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Talkback 2 comments

    Interesting Cory P. -- 03/04/07

    Wow, now its gonna be even easier to download vista and instal it illeagaly. Im incredibly surprised that microsoft would do this since they know this is gonna spur alot of ileagal activities.

    Back to the mainframe days Steve Roper -- 03/04/07

    This trend in diskless PCs and centralised network storage seems to me to be the start of a return to the good old days, where you had dumb terminals time-sharing on a central mainframe. I remember the massive one they had in the old AG Data building in Adelaide back in the 80's - now occupied by Primus, sans the punchcards, Winchester disks and screaming dot-matrix printers.

    Only now, the mainframe isn't the processor - it's just the data and application storage. That stands to reason; the desktop PC on which I type this post has fifty times the processing power that entire building had back in 1983. But speaking as a programmer, designing an application to run on a single machine with known hardware and software characteristics is a hell of lot easier than coding the bloatware required to be able to run on a multitude of hardware and software configurations.

    For this reason, I've been developing Web applications for some years now - because a Web application is the closest we can come these days to the old mainframe-terminal configuration. A Linux Web server running Perl, MySQL and Apache is a known quantity, and your code will behave on it pretty much as you expect it to. Handling the plethora of browsers out there, though, is a completely different breed of dog.

    So in spite of Microsoft's expectations, I hope this new trend takes off. Centralised computing makes for more stable applications, and when things do go pear-shaped (as they did for me just recently) it makes them so much easier to fix up, and the fix affects everyone right away. No endless fielding of bug reports and complaints because people haven't upgraded to the latest version, just a single code patch and you're away. "Yes sir, that's been fixed now, just log back in and your orders will all be visible."

    Yes - bring back centralised computing! It'll benefit everyone, programmers and users alike.

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