After rejecting standards war, virtualization vendors start supporting common spec
Citrix announces tools, based on OVF specification, for building virtual appliances
Computerworld - Standards wars, such as the Blu-ray vs. HD-DVD battle, can keep many potential users on the sidelines until a winner is declared. Virtualization software vendors are trying to avoid just such a battle over the adoption of virtual appliances.
Such appliances are software bundles containing an operating system and application that have been preconfigured and tuned to run in a virtualized environment. The idea is to ease and speed up deployment of new virtualized applications, but that's contingent on the virtual appliances being able to work with various virtualization technologies, such as VMware Inc.'s ESX Server, Citrix Systems Inc.'s XenServer and Microsoft Corp.'s new Hyper-V software.
Those three vendors, along with IBM, Hewlett-Packard Co. and Dell Inc., have been working since last year with Distributed Management Task Force Inc. (DMTF), a Portland, Ore.-based standards group, to create an interoperability specification for virtual machines. And they're now far enough along on the specification, called the Open Virtual Machine Format — or OVF, for short — to build tools that conform to it.
Citrix, which bought its way into the server virtualization market by acquiring XenSource Inc. last year, announced today that it plans to offer tools for creating virtual appliances that can run on multiple virtualization hypervisors, whether they're from Citrix itself or VMware, Microsoft and other vendors.
The new tools, which are being developed under an initiative called Project Kensho, are aimed at users as well as independent software vendors and are scheduled for release in a technical preview during the current quarter.
Simon Crosby, chief technology officer at Citrix's virtualization and management division, said the OVF specification is critical to the adoption of virtual appliances. If the virtualization market were to bifurcate around different formats, "it really ruins a lot of the benefits of virtualization," Crosby said. He added that in addition to the obvious benefits for independent software vendors, enterprises could use OVF to make their internally developed applications platform-independent.
Chris Wolf, an analyst at Burton Group in Midvale, Utah, said that OVF Version 1.0 is primarily a specification for distributing virtual machines and importing them into customer environments. He also said he thinks the specification has a ways to go before it becomes really useful. For instance, the spec needs more development to enable users to manage the appliances in a heterogeneous environment, Wolf said. But he added that he thinks the vendors and the DMTF are on the path to accomplish that in later releases of OVF.
As the dominant vendor in the virtualization market, VMware has the most to lose by backing an interoperability specification. But Wolf sees VMware's support for OVF as being linked to its desire to get the investment it has made in management tools to pay off.
Virtual appliances are still limited in use, and Wolf said that Microsoft, for one, is heading down a different path with its support for streaming applications to the desktop.
Read more about Virtualization in Computerworld's Virtualization Topic Center.
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