5 server virtualization snafus -- and how to handle them

Server virtualization can cause storage problems like I/O bottlenecks or complicated disaster and recovery efforts, but they can be avoided

Some large-scale IT departments are even making a complete switch to technologies like an NFS-NAS setup, which is ready to go into production underneath a virtual infrastructure. "You can store a whole bunch of virtual machines on one storage mount point and not have a lot of complexity around that," says Boles. "There aren't nearly as many headaches as trying to coordinate some of those physical storage resources with a very virtual server infrastructure."

5. Trouble choosing the right kind of networked storage for virtualized servers

Some 18 percent of the storage professionals surveyed said that they can't decide on the right kind of networked storage for virtualized servers. "The right kind of networked storage makes a difference -- because you can scale, and get better performance and more simplicity in your processes [if you choose correctly]," Boles says. But the right solution depends largely on the organization's objectives.

At Purdue University's Krannert School of Management, for instance, the IT department's top priority wasn't 24/7 availability for its virtualized environment, but rather fast recovery time when -- not if -- the system went down, says IT manager Jeff Ellow.

Virtualizing storage-intensive servers without big performance losses requires a level of storage performance that SANs weren't able to achieve. The obvious choice for Purdue seemed to be 10 Gigabit iSCSI, but cost was a deterrent. Purdue ultimately went with LSI 6Gbps SAS switching technologies, which offered the benefits of a failover SAN and the performance of an end-to-end native SAS 6Gbps data path --and which the school could afford.

"Even if our SAN goes down, we have enough local storage where we could limp along in another mode. Restoring more quickly is more important than staying up," Ellow says.

How to deal: Before choosing any vendor, be sure you understand the management capabilities, Barnes says. Server and storage virtualization can be simple: "You don't have to be a rocket scientist or have a degree in SAN management to take care of these things," he says.

At the end of the day, Elam says the benefits of virtualization are worth the trouble of grappling with these five challenges. "The pros far outweigh the cons just in its complete ease of use, stability, high availability, being able to replicate and do maintenance during the day, move stuff around as you need to and take hardware offline," he says "There are lots of things you don't have to come in on a weekend to do anymore."

This story, "5 server virtualization snafus -- and how to handle them" was originally published by Computerworld.

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