Hyper-V add-on allows seamless movement of virtual machines

Third-party software from Sanbolic prevents user interruptions

Sanbolic has adapted its clustered file system to support Microsoft's upcoming hypervisor, allowing IT shops to move a virtual machine from one physical server to another without affecting users.

While server virtualization market leader VMware enables the seamless movement of virtual machines with a product called VMotion, Microsoft's Windows Server 2008 Hyper-V, currently in beta, lacks such technology, according to Bill Stevenson, Sanbolic's executive chairman.

"Clustered file systems are a complex technology and Microsoft currently does not have technology in-house that enables them to do that," Stevenson says.

With Sanbolic supporting Hyper-V, a file that contains a virtual machine image can be stored in a shared LUN storage unit, and be accessed by multiple physical servers, he says. Any virtual machine can then run on any physical host.

"To move a virtual machine from one physical server to another physical server, there's no need to change anything in the storage connection because both machines see that image," he says. "You stop it on one machine and start it on another machine."

PolyServe, a network-attached storage vendor acquired by HP last year, makes a similar clustered file system product

The new Sanbolic Melio 2008 clustered file system is being announced Monday, one day before the VMworld Europe 2008 Conference in Cannes, France.

Microsoft, which is attending VMworld to give demos of Hyper-V, acknowledged Sanbolic's support of its hypervisor. "We are very pleased that Sanbolic's clustered file systems will be available to our customers as they deploy virtualized applications on Windows Server 2008 Hyper-V," said Zane Adam, senior director of virtualization strategy at Microsoft, in a press release.

But Sanbolic technology won't actually be embedded in Hyper-V, leaving the door open for Microsoft to build its own technology or pursue other partnerships.

"They have not bundled or OEM'd the product at this point. ... That could change over the next six months," Stevenson says. "We expect to be publishing joint reference architectures."

Without a clustered file system like Sanbolic's, moving virtual servers created by Hyper-V to a different physical machine requires some extra legwork, such as copying a virtual machine image to storage that can be accessed by the second physical server.

That can get complicated when you have hundreds of virtual machines, Stevenson says.

While that extra work is eliminated with Sanbolic, moving a virtual machine would still require about 5 to 10 seconds of application downtime, he says.

Sanbolic's technology costs US$5,000 for each server connected to shared storage.

Join the PC World newsletter!

Error: Please check your email address.

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Jon Brodkin

Network World
Show Comments


Microsoft L5V-00027 Sculpt Ergonomic Keyboard Desktop

Learn more >

Lexar® JumpDrive® S57 USB 3.0 flash drive

Learn more >


Lexar® JumpDrive® S45 USB 3.0 flash drive 

Learn more >


Lexar® Professional 1800x microSDHC™/microSDXC™ UHS-II cards 

Learn more >

Lexar® JumpDrive® C20c USB Type-C flash drive 

Learn more >

HD Pan/Tilt Wi-Fi Camera with Night Vision NC450

Learn more >

Audio-Technica ATH-ANC70 Noise Cancelling Headphones

Learn more >


Back To Business Guide

Click for more ›

Most Popular Reviews

Latest News Articles


GGG Evaluation Team

Michael Hargreaves

Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Kathy Cassidy


First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni


For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell


The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi


The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?