Absorbing the PC

Robert L. Mitchell   Today’s Top Stories   or  Other Hardware Stories  

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January 23, 2006 (Computerworld) -- Information technology has taken to the idea of server blades. So why not PC blades? The convergence of more efficient architectures with virtualization technologies could make PC blades a more attractive proposition for specific end-user roles, such as in call centers. And more is in store with this technology.
PC blades move the PC hardware into the data center, leaving a thin client on the desktop that essentially functions as an extended keyboard, monitor and mouse. Like server blades, PC blades fit into a chassis that can be centrally managed. But just putting users' PCs in the data center misses the point. "I don't think there needs to be a one-to-one relationship between users and PCs," the CIO at a large insurance company once told me. "Isn't there an enormous amount of processing power that's wasted in that?"
Blade vendors finally have an answer.
Like server blades before them, PC blades are becoming consolidation platforms. For example, ClearCube Technology in Austin offers a management tool for its PC blades called Grid Center that allows up to five users to share a single blade. It also maps users to a pool of PC blade resources that can be dynamically allocated to any user rather than being dedicated to a single user's thin terminal. Meanwhile, Hewlett-Packard is working on technology in its Consolidated Client Infrastructure that will enable administrators to create different tiers of PC blades and provision them based on users' roles.
IBM has taken PC blade virtualization even further. Its Virtual Hosted Client Infrastructure brings the PC blade and server blade functions under a single architectural umbrella. The system enables a thin client to access a PC virtual machine running on a server blade within a BladeCenter chassis. The design uses EMC's VMware and ClearCube's Grid Center to support up to 14 PC sessions per blade. Such consolidation offers much greater efficiencies than just simplifying PC management by centralizing the system hardware. The rigid, "one user to one PC blade" design is disappearing.
It gets better. Today, users attached to a failed ClearCube blade can be quickly moved over to another available blade. The process requires administrator intervention, but ClearCube says it has nearly completed work on an automated fail-over process that avoids interrupting the user session. The next logical step might be to provide tools that let administrators "lift and shift" live user sessions between PC blades for maintenance reasons -- something administrators can do with server blades today using VMware's VMotion.
IBM sees room for further consolidation. Today, a user can be mapped only to the virtual machines that reside on a single blade. By the third quarter,

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