The Virtualization Room

Jun 17 2008   9:27AM GMT

Expect Open Virtual Machine Format release soon, says DMTF

Keith Harrell Profile: SAS70ExPERT

The virtualization world is still waiting for the official release of the Open Virtual Machine File Format, or OVF, once Distributed Management Task Force (DMTF) puts the finishing touches on what will be an industry standard virtual machine (VM) format. According to DMTF’s Christy Leung the organization plans to announce the release of OVF over the next couple of months.

OVF frees users from platform dependence in virtual environments, enabling them to mix and match platforms without incurring interoperability problems. Despite the clear benefits of a common format in a multiplatform virtualization landscape, a universal format has encountered some roadblocks.

Since late 2007, DMTF has worked on OVF when Dell, HP, IBM, Microsoft, VMware and XenSource submitted a proposal for a standardized format for VMs. At the upcoming Burton Group Catalyst conference later this month, DMTF member organizations — including VMware, Citrix, and Novell — will demonstrate OVF interoperability publicly for the first time. According to Burton Group analyst Chris Wolf, “some vendors moved OVF support higher up on their development roadmap in order to have it ready in time to demonstrate at the Catalyst conference.”

Wolf says that OVF is worth the wait — and the investment in the long term. “OVF has a nice long-term goal of standardizing the way hypervisors mount and run VMs,” says Wolf, “but its immediate use is primarily in importing VMs and standardize how VM metadata is managed.”

Wolf goes on to say that while OVF VMs will soon be able to load onto any hypervisor, a virtual hard disk conversion may be required as part of the import process because of the presence of two primary virtual hard disk formats in play: Virtual Machine Disk Format for VMware and Virtual Hard Disk for Microsoft and Xen. “OVF would have even more value if all vendors could agree to use a single standardized virtual hard disk format,” according to Wolf. “Thus far, the reasons for not having a single virtual hard disk format are more political than technological.”

When DTMF finishes its work, OVF will greatly improve the functionality of virtual machines. “OVF metadata is extensible, so any software vendor could use OVF to embed their management metadata inside VMs, regardless of hypervisor,” says Wolf.

“That is a big deal, as vendors could have a consistent management methodology regardless of hypervisor.”

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