by Angela Miller
With the focus ever increasing on energy efficiency in the data center, the topic of virtualization takes center stage for many organizations. Both the performance of the newly-launched VMWare stock on the New York Stock Exchange (from around $29 at IPO to almost $68 today) and Microsoft’s impending push into the virtualization arena demonstrate that virtualization will be a hot topic over the next year.

But the benefits of virtualization are not limited to large data centers, and many organizations miss out on the energy efficiency and cooling benefits of deploying virtualization even in their small IT shop.

According to Gartner, server virtualization is just entering the peak of the hype cycle and it is 2-5 years from “mainstream adoption.”  This means that over the next couple of years, IT managers will watch as over 50 vendors vie for marketshare in this re-energized space.

Ironically, virtualization is a mature discipline with over 30 years of history in the IT world. It was a key component of any mainframe deployment as early as the 1970s. But with the proliferation of servers and storage devices and burgeoning IT data centers, virtualization has come around again as a way to more effectively utilize the IT resource.

The impact of virtualization on the environment may not be immediately obvious. But think of it this way: in a company where the trend is for users to specify they must have servers dedicated to their function, virtualization is a way to segment pieces of the IT infrastructure to provide those dedicated services without requiring the purchase of separate machines. One powerful server can be segmented into dedicated, non-overlapping functions.

This is a powerful utility, especially when you consider that according to various studies the average usage on a dedicated, stand-alone, functional server is less than 10%.

Virtualization comes in many flavors, from server virtualization through hardware and software, to storage virtualization, to the ability to combine many machines into one virtual device.

Server Virtualization

Server virtualization is either hardware, software, or processor-based. In a hardware scenario, software like VMWare is installed at an operating system layer and allows emulation. Emulation simply means that a server running Linux for example could also run Microsoft Windows inside of a window within Linux. The basic idea behind this virtualization is that the intermediate software intercepts calls from the emulation window and translates those calls into the underlying operating system to pass to the hardware. The virtualization tool simply serves as a translator between the different environments.

There are many reasons to do this, even at a desktop level. For instance, if you are a small business and you have chosen Apple as your platform, you can install tools to allow you to still run Microsoft Windows within a window on the Apple platform.   A small business might do this when they are required to use a particular Windows-based tool to interact with a client and do not wish to procure a new machine. From an environmental perspective, emulation allows companies large and small to run multiple operating systems without requiring acquisition of additional hardware.

The second approach to virtualization is to segment the device into multiple operating systems and allowing these environments to operate independently and simultaneously on one device. In this scenario, the server would run both Linux and Windows at the same time and there would be no conversation between the operating environments – each would make calls to the hardware separately and natively. This approach grew more popular with the release of blade type servers by companies like IBM, HP, Dell and Sun.

Blade servers are quite effective in the data center from an environmental perspective. They are typically stripped of redundant components like power supplies. They are compact and have a small impact on the data center physical footprint. And they are efficient because many servers share so many components. Less waste, less energy, less real estate … all good things from an environmental perspective. (One potential downfall of a densely-populated blade server environment is cooling cost. We’ll cover this in a separate post.)

At the component level, some processors by Intel and AMD now come with native functionality to support virtualization. With newer multi-core, multi-threaded processors, the processor can deliver on the virtualization promise by increasing performance by 3-5 times within one processor (according to IDC). Given the heat generation of the processor, the ability to minimize the number of required processors is highly desirable from an environmental perspective.

Server virtualization clearly delivers significant energy savings to companies that can consolidate their environment effectively.

Storage Virtualization

Like server virtualization, storage virtualization comes in many flavors and tends to be far more complex. The primary theories on storage virtualization are appliance-based, switch-based, and storage-controller based. All three approaches basically rely on mapping tables to route application requests between a virtual location and a physical location on the disk. Without detailing the specifics in each scenario, the bottom line on storage virtualization is that it allows large data centers the ability to deploy very large, disk-dense devices that again are far more efficient than a distributed set of independent devices.

So to build on the blade server discussion: deploying many stand-alone servers each with their own disk storage that is minimally utilized is far less efficient than installing blade servers without any native storage and then linking them to a large storage array or network as a separate, optimized device.

From an environmental perspective, one can argue which architectural approach to storage virtualization is more efficient, but the use of storage virtualization in any context is far more energy, cooling, and footprint efficient for the enterprise data center.

Conclusion

Server and storage virtualization should be key components to any green IT strategy. Both deliver significant energy and cooling cost savings to the enterprise and SMB through consolidation of resources.

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I relied on the following sites for analysis in support of this post:

Vmware
Gartner
IBM
Dell
AMD
Intel
Sun
IDC
ESG
Wikipedia

PodTech posted an interesting discussion with HP’s Senior Vice President of Technology Services. While most of the big IT vendors are making a play in this arena now, this interview was a quick and accessible discussion of one vendor’s approach to power management.

by Angela MillerI read with interest Western Digital’s announcement of their new GreenPower Drives. Their marketing statement is that this line of drives can save a significant amount of energy over all their competitors’ drives. Western Digital intends to deploy the GreenPower technology primarily on their desktop and notebook drives – most notably on the 3.5″ Caviar SATA drives and the 2.5″ Scorpio mobile drives. They will launch their enterprise GP drives in the later part of 2007.  Their specifications and cited industry research assert that they can save 4-5 watts over competitor drives in idle mode. I tried to substantiate this number with some simple research of specifications offered by the different main competitors in the space using the 3.5″ Caviar SATA 500GB drive as the primary comparison. Because Western Digital has not yet announced specifications for the enterprise, I chose three primary competitors based on Gartner estimates of the share of the desktop market: Seagate, Hitachi Global Storage Technologies, and Samsung.

Looking at these numbers is a little like looking at the MPG estimate stickers on cars so it also seemed prudent to see whether any respected technical testing entities had put these drives through their paces. While a review of Tom’s Hardware, AnandTech, ComputerWorld, Storage IO, and The Tech Report, showed that none of these entities had yet tested the Western Digital GP specification, most other specifications came close to the advertised numbers.From an enterprise IT perspective, choosing a drive that natively uses significantly less power than comparable drives will result in energy savings. If a company converts to drives that will use ½ of the power of other drives, the company might save as much as $10/year/drive in energy cost.But as a former IT manager, I would have a few concerns:- In my experience, IT Managers at the enterprise level make decisions about desktop equipment based on the computer vendor rather than components. Rarely would the IT manager specify a particular hard drive, or make a decision on the vendor based solely on the hard drive they offer.- At the enterprise level, IT Managers depend on vendors to provide an overall solution: you could not approach HDS and request Western Digital as a drive vendor when their OEM providers are HGST and Seagate.- None of the drives will attain peak energy efficiency performance numbers without serious consideration to configuration, software setup, and consolidation. The bottom line- one 1TB drive will use less energy than 4 250GB drives.The important take-away from the Western Digital announcement from my perspective: Western Digital is setting the bar higher for energy efficiency and will force their competitors to rise to that expectation in order to retain market share. This energy efficiency innovation will stimulate the hard drive market toward more future improvements.

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I relied on the following sites for analysis in support of this post:GartnerWestern DigitalSamsungHitachi Global Storage TechnologiesSeagateTom’s HardwareAnandTechStorageIOThe Tech Report

by Angela Miller
This week the ecology.IT blog officially moved to a web hosting service that is 100% solar-powered. GreenestHost.com was featured in Ted Samson’s blog 2 weeks ago and officially came online on August 6, 2007.

A couple of things impressed me about this company:

• They worked closely with vendors including AMD, VMWare, and Freus, to ensure they both chose the right technology and configured it appropriately for optimal energy efficiency and cooling.
• They worked with a mature company (AISO) to develop a web-hosting service built on a solid foundation.
• They deployed a solar environment that is self-sufficient and integrated with a battery system for use at night.

While this is not an endorsement or recommendation that everyone should switch to Greenesthost.com as a service provider, it does highlight that there is business sense in establishing and offering green computing technologies.

by Angela MillerI’ve been reading the US Evironmental Protection Agency’s (US EPA) latest report to Congress on Server and Data Center Efficiency released earlier this week. This comprehensive analysis of the current trends in energy usage and potential future demands for servers and data centers in the United States projects that in the next five years the demand could double from an estimated 60 billion Kwh/yr to over 120. In five years.In spite of all the other science that precedes it, this study will likely be the impetus for the US to consider stricter rules on energy efficiency for information technology devices. The legislation passed yesterday regarding renewable electricity and new taxes on oil heralds other changes likely to come from the US Congress. Regardless of the whims of Washington, the EPA report confirms the need for companies large and small to substantively change IT strategies.Consider the report’s discussion of power density issues:

Increasing power density can lead to a situation in which companies are forced to build new data centers not because they are running out of floor space but because they need power and cooling beyond what can be provided in their existing data centers. This situation has driven much of the recent interest in energy-efficiency improvements for data centers. If the power consumed (and resulting heat generated) in data centers can be reduced through energy-efficiency measures, the existing infrastructure can continue to meet cooling and power needs, and costly investments in new data centers can be deferred. (USEPA, 2007)

The report highlights simple changes that IT Departments could implement today without significant investment beyond operational changes, many of which echo strategies discussed in previous ecology.IT posts:

• Consolidation
• Retirement of Unused Legacy Equipment
• Enabling current power management tools on all servers and storage devices
• Replacement of equipment with newer, more energy efficient devices through attrition over time
• Shifting of equipment for optimal airflow management

In their estimate, these simple operational changes could result in a 20% energy savings relative to current trends. A 20% change right to the company’s bottom line with primarily operational strategies.Over the next few weeks we will investigate some of the proposed “best-practice” and “state-of-the-art” changes proposed in the EPA study. They assert that by implementing these strategies we could save up to 55% of the current energy forecast.

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I relied on the following sites for analysis in support of this post:US EPA Final Report on Server and Data Center Energy EfficiencyNew York Times Article on Energy Bill

by Angela Miller
I had a very interesting conversation with David Merrill today about one of the significant challenges that CIOs face: the economics of energy efficiency in the data center. Mr. Merrill (in my humble opinion) is a thought leader in Storage Economics, and for the last 18 months he’s been blogging about this discipline for Hitachi Data Systems*. He had some interesting tidbits regarding energy usage in data centers, the most compelling of which for me was that the typical enterprise data center now consumes 50% of the company’s electric bill and nearly 50% of that is due to storage. He backed these numbers up with studies from Gartner (March 2007) and ESG (July 2007).

Pondering these statistics lead to a conversation about the economics of energy efficiency and the business case for green computing. From Mr. Merrill’s perspective, the business case for the typical CIO would be built on cost savings from energy efficiency, cooling optimization, and from the floor space savings that could be realized from implementing a sustainable infrastructure strategy.

“CIOs typically choose energy efficiency not for moral consciousness or being chic or trendy, but because it makes economic sense”. — David Merrill

My thoughts went to challenging information technology departments to take green computing further than the straight energy costs and how instead to sell the business case for environmental benefits. His response was realistic: environmental benefits tend to be in addition to the bottom line economics, either through compliance with laws, or certification, or deferring spending on future solutions. In other words, for a CIO, environmental choices would rarely justify a business case on their own.

We talked about hybrid vehicle sales in the United States as a case study: while some individuals invested in hybrid vehicles purely as an environmental statement; the sales of hybrids, especially in states like California, really escalated when the gas prices rose substantially and drove consumers to make practical, economic choices.

In some parts of the world, especially in Europe or in densely-populated small regions like New England, Singapore, and Hong Kong for example, CIOs will start to face the reality that energy prices will drive up their IT budgets substantially. The local energy utility may either charge escalating utility rates or be unable to deliver energy to meet the company’s growing demands.

For these CIOs, the challenges of space, power, and cooling constraints drive them to consider green computing strategies to squeeze the maximum benefit from their infrastructure. So like the substantial growth in purchases of hybrid vehicles accompanied substantial increases in gasoline prices, so too will green computing initiatives likely increase as IT teams strategize to overcome their energy, space, and cooling challenges and their unsustainable consumption model.

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Storage.ITworld.com article on David Merrill
*I am a former employee of HDS. This post is in no way affiliated with HDS.