Creating energy-efficient data centers

for sustainable business outcomes

White paper

Table of contents

Table of contents.................................................................................................1

Executive summary .............................................................................................2

Energy efficiency in the data center: why it matters to your company .........................2

Technologies that address energy efficiency ...........................................................3

Best practices for improving energy efficiency in your data center .............................4

Steps to increasing data center energy efficiency ....................................................6

How HP can help you meet your energy and environmental challenges .....................6

The road ahead ..................................................................................................7

Creating an energy-efficient data center ................................................................8

To l earn more.....................................................................................................8

Reduce energy costs and

environmental impact—while

increasing computing performance

Executive summary

In data centers around the world, power and cooling

costs are rising rapidly and consuming an ever-larger

portion of IT budgets. This trend is taking place in a time

in which companies are feeling increasing pressure to

operate in a more environmentally sustainable manner.

This paper explores technologies and best practice that

can help your organization respond to today’s power

and cooling challenges in a manner that reduces both

energy expenditures and environmental impacts—while

increasing computing performance.

Energy efficiency in the data center:

why it matters to your company

To further accelerate costs, servers and storage devices

are consuming ever-larger amounts of electricity,

and demanding ever-larger amounts of power and

cooling capacity.

First, take the case of servers. The U.S. Environmental

Protection Agency estimates that the amount of power

consumed by servers will double in the next five years.

Worldwide, servers now account for as much as one

percent of power consumption.

1

Two key dynamics

are driving the steep server power-consumption

curve: increasing server densities and rapid growth

in applications.

Server power density is growing by an annual rate

of about four percent.

2

Across a wide range of server

types, the heat load per product footprint is on the

rise. But this alone isn’t causing the doubling of power

consumption every five years. What’s really driving

the problem is increased growth in applications.

There is a huge and increasing demand for software

applications. Application growth is now outpacing

gains in server efficiency and performance.

So what about bigger, faster processors? While new

servers use ever faster processors, the power crunch

doesn’t stem from increasing server performance. That’s

because server efficiency is improving. Since the late

1990s, server performance per watt of power used has

been doubling every two years.

3

So in simple terms,

we’re all getting more computational performance for

the money we’re spending to power computers.

Storage, too, is proving to be a major consumer of

electricity. While servers account for an estimated 48

percent of the power consumed by data center

hardware devices (excluding air conditioning systems),

storage systems account for 37 to 40 percent.

4

What’s

driving up the power bills for storage? Companies are

saving more data, and storage is doubling about every

18 months. To compound the problem, companies have

to retain information for longer periods of time. This all

leads to more demand for storage capacity, and more

demand for electricity to power the storage hardware.

The rising power consumption is driving up data center

costs. At today’s energy prices, for example, by 2008 the

energy costs for running a server will exceed the costs of

buying the server.

5

And when you couple server energy

costs with associated infrastructure costs—including

the costs of data center generators, power supplies and

air conditioning systems—the overall cost of power

and cooling a server now doubles the cost of buying

the server.

This is a dramatic change for companies. As recently

as the 1990s, many companies considered power and

cooling costs as a negligible expense relative to the cost

of buying IT equipment. Today, with power and cooling

costs running out of control, this view has changed. And

as energy costs continue to rise, the numbers will only

get worse for status quo environments. Clearly, strategic

changes are in order.

The business case for improving energy costs and

reducing consumption

Anymore, it’s not hard to build a business case for

improving energy costs. Cutting energy consumption

and costs is now a strategic focus of many companies.

In the drive to lower energy costs, some companies are

locating data centers near power-generation sources

that offer plentiful supplies of lower-cost energy. That’s

the case with some Internet companies, for example,

that are building massive data centers near the Grand

Coulee Dam in the northwestern United States.

While searching for lower-cost energy, companies are

driving toward better efficiency. Gains in efficiency

improve not only energy costs but also infrastructure

costs. This lower cost structure makes your company

more competitive.

This focus isn’t just for budgetary reasons, however.

Companies are feeling increasing public and regulatory

pressure to operate in a more environmentally sustainable

manner. Cutting energy consumption is one of the keys to

reducing greenhouse emissions and a company’s carbon

footprint—and to creating a greener, more sustainable

business. This sort of environmental responsibility is

emerging as an important differentiator for companies

across a wide range of industries.

2

1

“Report to Congress on Server and Data Center Energy Efficiency Public Law

109- 431,” U.S. Environmental Protection Agency, 23 April 2007

2

Datacom Equipment Power Trends and Cooling Applications (ASHRAE)

3

Belady, C., “In the Data Center, Power and Cooling Costs More than IT

Equipment it Supports,” Electronics Cooling Magazine (February 2007)

4

“Green storage means money saved on power,” Network World,

May 21, 2007

5

Belady, C., “In the Data Center, Power and Cooling Costs More than IT

Equipment it Supports,” Electronics Cooling Magazine (February 2007)

Technologies that address energy

efficiency

To address today’s challenges, data center and

facilities managers have begun to think in terms of

overall power and cooling resource management. The

goal is to eliminate the over-provisioning of power and

cooling resources and to increase utilization of all the

equipment in a data center. In these efforts, forward-

looking companies are leveraging a wide range of

power and cooling technologies that can help cut

power consumption.

Server-level technologies

One way to cut power consumption is to throttle down

processors that don’t need to be running at full force.

Throttling allows an underutilized processor to use less

power. Typically a processor will have a maximum

frequency. When this processor is being underutilized,

you can use throttling technologies to put it into a

lower state, which means it runs at a lower frequency.

When it runs at a lower frequency, the processor uses

less power. In some cases, just by enabling the use of

simple component throttling, you can cut processor

power consumption by as much as 10 percent and

cooling requirements by up to 10 percent.

6

Virtualization is another server-level technology that

can help cut your energy bills. Virtualization allows

you to combine the workloads of several underutilized

servers onto a single server that is utilized more fully.

This approach allows you to reduce your power

footprint because you need fewer servers to do the

same amount of work. This can help you achieve

power savings of up to 50 percent.

Storage-level technologies

There are many emerging technologies that can help

cut the energy bills associated with data storage.

These include:

• Thin provisioning and dynamic capacity management—

These complementary technologies enable storage

systems to make more efficient use of capacity. With

these technologies, storage systems require as much

as 50 percent less storage than systems without the

same technologies. Fewer disk drives means less

power required.

• Logical snapshots and writeable snapshots—

Organizations often have many copies of data

that they use for many different purposes. Logical

snapshots are space efficient and save significant

disk space compared to full copies. A writeable

snapshot shares the source data with the original

primary data and only uses additional capacity

to track changes that are made to the writeable

snapshot. This technology can lead to significant

capacity savings, and associated energy savings.

• Data compression—This widely used technology

allows you to store more data within the same

amount of space. Depending on the type of data

and the compression schemes, you might be able

to compress some files to half their original size.

• Data de-duplication—The process of examining and

eliminating duplicate data can help you optimize

storage capacity. Data de-duplication can reduce

capacity requirements by more than 20 times. It is

mostly found in disk-to-disk backup and disk-based

archiving solutions today but is expected to soon

move up to online storage systems.

• Tiered storage—60 to 80 percent of all data is

dormant 90 days after it is created. This gives you

the opportunity to save disk storage capacity by

moving this less-used data to tape storage.

7

3

Figure 1. Costly trends

When you couple server energy

costs with associated infrastructure

costs, the overall cost of power

and cooling a server now doubles

the cost of buying the server.

Infrastructure costs and energy costs have exceeded server costs

Annualized data center costs

•

I&E costs are no longer negligible

(as they were in the 90s)

•

I&E costs are 2X that of a 1U server today

(more tomorrow)

•

Energy costs are rising and will make things worse

•

Typical 50,000 sq ft and 5 megawatt data center

can cost $61–$133 million

4000

3000

2000

10 0 0

0

1990 1995 2000 2005 2010 2015 2020

2001

2008

2004

Server cost

Infrastructure cost

Energy cost

Annual I&E

6

HP Insight Control, Power Regulator 3rd Edition Tech Brief February 2007,

ISS Performance Testing Engineering assuming 320 watt server

7

“Power, Cooling, Space Efficient Storage,” by Tony Asaro, Senior Analyst,

Enterprise Strategy Group (July 2007)

Source: Belady, C., “In the Data Center, Power and Cooling Costs More than IT Equipment it Supports”, Electronics

Cooling Magazine (Feb 2007). Calculated with IT and cooling power and electricity cost of $0.1/kW-hr

Rack-level technologies

Another area of focus is integrated power management

at the rack or chassis level. That’s the case with blade

technology. Technology is now available to pool the

power and management of an entire blade chassis, and

all the server blades within it. This pooled approach

allows better management of power and cooling, for

energy savings of up to 25 percent.

8

Data center-level technologies

At a broader level, companies are focusing on overall

data center power and cooling management. The focus

here is on managing power and cooling resources based

on specific needs, as opposed to simply over-provisioning

resources so you’re sure all your needs are covered.

For example, without the right management tools in

place, you might find yourself putting in a lot of extra

cooling capacity to address the problem of some hot,

high-power racks you’ve added at one end of your

data center. If you aren’t set up to provision cooling

selectively, you end up over-provisioning cooling to

the entire data center.

But with the right technologies in place, you could

instead target extra cooling capacity to the spots where

you really need it. With technologies that enable

selective cooling, you might achieve data center power

and cooling savings of 15 to 45 percent.

Closely coupled cooling

Another important data center trend is closely coupled

cooling. Closely coupled cooling makes your cooling

solutions more sensitive to individual pieces of IT

equipment and their cooling requirements. With this

approach, the cool air doesn’t have to travel a long

distance and mix with warmer air along the way. That

mixing equates to lost efficiency and higher energy bills.

One approach to closely coupled cooling moves

computer room air conditioners, or CRACs, off the

walls of the data center and positions them closer to

heat loads. This is sometimes referred to as “CRAC

by the rack.” With this approach, air is more localized.

There is less opportunity for the mixing of cool and

hot air. Less mixing equals more efficiency.

We’re also seeing the emergence of liquid-cooled racks.

This approach improves efficiency and power density

even further by bringing the cooling right into the rack.

You essentially create an enclosed box, or rack, with

built-in cooling capabilities. Servers pull in cool air

from one side of the rack and send hot air out of the

other side of the rack. The air then passes through a

heat exchanger, gets cooled and flows back to the

other side of the rack. With liquid-cooled racks, there

is very little opportunity for hot and cool air to mix, so

you have greater efficiency.

Looking ahead a bit, we may eventually see the advent

of direct liquid cooling, which brings cooling down to the

chip level. There is currently a lot of industry discussion

around this approach.

So the trend is clear: Data center cooling capabilities

are marching closer and closer to heat sources. And

in general, the closer you get, the greater the efficiency.

Many new technologies are emerging to enable

this trend.

Best practices for improving energy

efficiency in your data center

There are many best practices that can help improve

the efficiency of your data center. Some of the more

important best practices follow. This list is based on

our experiences in data centers around the world,

our research efforts and our close involvement with

organizations such as the Green Grid, an industry

consortium focused on energy efficiency in the

data center.

You don’t necessarily have to have budget in place to

pay for power and cooling best practices in your data

center. Many of these approaches are virtually free.

Use a hot aisle/cold aisle design.

One important best practice in data center design is

to alternate hot and cold aisles. With this more energy-

efficient layout, server racks are placed front-to-front in

the cold aisle and back-to-back in the hot aisle. In the

cold aisle, cool air comes up out of floor vents to cool

the server racks. In the hot aisle, the hot exhaust comes

out of the back of the servers and flows up into the

data center room. This layout creates greater segre

-

gation of hot air and cool air, which equates to gains

in cooling efficiency.

Match server airflows.

It’s important to match server airflows with the airflows

of your air conditioners or air handlers. If you can match

these airflows, you can better prevent hot air from the

hot aisle coming over the top of a server rack and

then rolling into the uppermost servers in the rack. This

situation can cause servers to overheat. When you match

your airflows, you do a better job of keeping the cool

air where it ought to be, and the hot air where it

ought to be.

Use long rows without gaps.

Server cabinets should be positioned in long rows

with no gaps in the rows. This design helps you better

separate hot air from cold air. Without gaps in your

rows, more of the cold air stays in the cold aisle and

more of the hot air stays in the hot aisle.

4

8

IDC white paper sponsored by HP, Forecasting Total Cost of Ownership for

Initial Deployments of Server Blades, Doc #202092, June 2006

Use cabinet blanking panels.

When you have an empty slot in a server rack, block

the hole with a cabinet blanking panel. Without a

blanking panel, hot air from the back side of the server

can flow through the opening and get ingested by the

server. You then have to provide additional cooling to

counteract the hot air that is coming through the rack.

A simple blanking panel will solve this problem.

Orient AC units perpendicular to hot aisles.

Air conditioning units should be positioned so they are

perpendicular to hot aisles. By putting the air conditioners

in hot aisles, you essentially use the hot aisle as a duct

that causes hot air to flow toward the air conditioner.

Seal cable cutouts.

Any time cold air leaks out of the back of a server into

a hot aisle, you’re mixing hot and cold air—and losing

efficiency. When you seal cable cutouts, you block

another pathway for the mixing of air.

Use 0.8 meter to 1.0 meter high floors.

Using higher raised floors can increase efficiency. It’s

much harder to distribute air evenly in a data center if

you don’t have enough air space under your floors. A

low floor tends to cause higher air velocities. You can

mitigate this problem by raising your floors to create

more air space and more uniform air pressure beneath

your floors.

Maintain high- and low-density areas.

When you maintain high-density and low-density areas

within your data center, you can focus your high-density

cooling technologies where they are most needed.

Thermal zone mapping capabilities help you identify the

areas of the data center that are influenced by each air

conditioning unit and to what extent the areas overlap.

This gives you the ability to turn down the cooling in one

area if you are over-provisioning, change the zones of

influence by adjusting the flow settings or direction,

and position high-density or mission-critical equipment

in zones that overlap to better protect the equipment

should a CRAC unit fail.

Consider economizers.

You can use power-economize modes on servers and

air conditioners to make equipment operate more

efficiently. In many cases, economizers are already in

place; they simply aren’t enabled.

Use metrics.

To truly understand the results you are getting, you need

to use metrics. The right metrics should give you a clear

indication of the progress you are making and the

energy you are saving.

You can measure your progress in terms of your Power

Usage Effectiveness (PUE) ratio.

9

This measure allows

you to track your improvements in terms of quantifiable

numbers. The PUE is a simple ratio that divides the

total amount of power coming into your data center by

your IT equipment power, or your critical load.

The PUE ratio enables your efforts to measure the right

thing, compare your results with benchmarks for your

industry and validate your suppliers’ claims. When

you adopt new, more efficient power and cooling

technologies, your PUE ratio should fall.

Multiple industry groups have adopted or are laying

the groundwork to adopt the PUE. These include the

American Society of Heating, Refrigerating and Air-

Conditioning Engineers (ASHRAE) and the Green

G rid industry consortium.

5

Figure 2. Closely coupled cooling

Closely coupled cooling

approaches move the cooling

solution closer to the heat source.

This increases energy efficiency.

Before Lots of mixing of hot and cold air stream

Better (CRAC by the rack) Slight mixing

Best (liquid cooled rack) No mixin g

T

CRAC

CRAC

T

CRAC

Ventilation tiles

Floor plenum

Equipment racks

Recirculation Short-circuit

AC

units

Room chilled water supply

Cool fluid

Hot fluid

Servers

Source: Christian Belady, Presented at the Uptime Conference on April 24, 2006

9

Malone, C., Belady, C., “Metrics to Characterize Data Center and IT

Equipment Energy Use,” Proceedings of 2006 Digital Power Forum,

Richardson, Texas (September 2006)

Business-driven benefits

Collectively, the best practices outlined here can yield very

tangible, business-driven benefits. They can help you:

• Reduce and control server temperatures to increase

the reliability of your systems

• Increase system and application uptime

• Increase server densities and open up space for

additional equipment, which can extend the life of

your data center

• Reduce energy usage and your total cost of

ownership (TCO)

• Reduce your carbon footprint and create a more

sustainable computing environment

Steps to increasing data center

energy efficiency

Creating a more energy-efficient data center is a stepwise

process. You can begin with some fundamental changes,

and work your way up from there. It may help to view

this progression in terms of four key steps.

1 0

Step 1. Use power management, virtualization and

consolidation technologies.

In many cases, a power management feature is already

on servers. Often turning on this feature is as simple as

pushing a button in an administrative console. The use of

power management can bring immediate power savings.

Virtualization is another approach that can help you hold

the line on rising power and cooling costs. Virtualization

allows you to pool and share servers, storage devices

and other IT assets to increase utilization. This allows

you to pack more computing capacity into the same

footprint. You can then consolidate hardware devices

to reduce the number of physical servers and storage

systems in your environment, which helps reduce your

power and cooling costs.

Step 2. Apply best practices.

The best practices outlined above can help you optimize

power and cooling efficiency.

Even if you can’t do them all, various combinations

of these best practices can help you increase energy

efficiency, reduce your energy bills and operate in a

more environmentally friendly manner.

Step 3. Tune your environment.

In this step, the focus shifts to tuning and optimizing

your overall data center. The use of computational fluid

dynamics (CFD) and other engineering tools can give

you a better understanding of your power and cooling

issues and opportunities. CFD, for instance, can help

you determine the best placement for equipment and

floor tiles to enable efficiency gains and power savings.

Step 4. Closely couple cooling solutions with individual

heat loads.

The fourth step in this process is to closely couple your

cooling solutions with the heat loads of individual pieces

of IT equipment. By narrowly targeting your cooling

capacity you can greatly increase the efficiency of your

cooling solutions.

These steps can help you cut costs and save energy, as

shown in Figure 3. In a typical data center, by simply

doing best practices, we project that you could save as

much as 20 percent of the power you are currently using.

If you tune further, using computational fluid dynamics,

your potential savings increase to 33 percent. And if you

look at new technologies for closely coupled cooling,

you might push your savings to as high as 47 percent.

11

These same steps might make it possible to put more

equipment into your data center. With these approaches,

you could conceivably nearly double the amount of IT

equipment in your data center.

How HP can help you meet your

energy and environmental challenges

HP offers a wide range of services and technologies

to help you address the energy and environmental

challenges that come with running a modern data center.

These offerings build on years of HP research, which

has yielded more than 1,000 energy-efficiency patents.

HP Dynamic Smart Cooling

HP Dynamic Smart Cooling technology sends cool air

to where it is most needed, when it is needed. With

this HP innovation, sensors deployed on racks feed

real-time thermal data to your management software.

This allows your computing equipment to interact with

the power and cooling facilities that support your data

center. This smarter, more holistic approach to cooling

is one of the keys to cutting your power bills.

HP IT Consolidation Solutions

IT complexity can impact the growth of your business and

drive up costs. Our IT Consolidation solutions respond

to this challenge with offerings that help you simplify,

optimize and automate your IT environment. From

the data center to the workplace, HP IT Consolidation

solutions transform your IT environment, shifting IT budget

from operations to innovation.

6

10

Belady, C., “How to Minimize Data Center Utility Bills,” Line 56 (September

5, 2006)

11

Malone, C., Belady, C., “Metrics to characterize Data Center and IT Equipment

Energy Use,” Proceedings of 2006 Digital Power Forum, Richardson, Texas

(September 2006)

HP Data Center Thermal Assessment Services

These services leverage sophisticated modeling tools and

techniques to determine the unique thermal conditions in

your data center. HP Services professionals can then

recommend changes to optimize climactic conditions and

reclaim capacity. These changes can help you postpone

or greatly reduce the need for costly mechanical

upgrades. The information generated by thermodynamic

modeling helps you understand what you need to do to

improve the efficiency of your data center and to gain

more value from your energy expenditures.

HP Thermal Logic technology

This groundbreaking HP technology helps control power

consumption and thermal output in HP BladeSystem,

ProLiant and Integrity servers. HP Thermal Logic

technology takes a holistic approach to power and

cooling management. It helps you control the balance

between power and cooling to boost data center energy

efficiency at the component, enclosure and rack levels.

Ultimately, this technology can make it possible to pack

more computing power into your data center while

holding the line on power consumption.

HP Insight Power Manager

HP Insight Power Manager is an integrated power

monitoring and management application that provides

centralized control of server power consumption and

thermal output at the data center level. It provides a

single pane of glass that you can use to measure,

regulate and cap power usage to make more efficient

use of your infrastructure. It extends the capacity of your

data centers by enabling you to reduce the amount of

power and cooling required for HP BladeSystem, ProLiant

and Integrity servers.

HP Modular Cooling System

The HP Modular Cooling System uses chilled water

and closed racks to supply uniformly distributed cool

air across the entire front of the server rack. This spot-

cooling solution allows hardware densities and power

consumption levels that in the past would have been

difficult, if not impossible, to support. With this cooling

technology, you can run up to 35 kilowatts per rack—

triple the standard cooling capacity of a single rack.

This means you can increase server densities within

the same footprint.

HP StorageWorks XP Thin Provisioning sof tware

HP StorageWorks XP Thin Provisioning software enables

you to allocate your anticipated future storage capacity

needs from a virtual storage pool. It reduces the amount

of physical disk capacity required. By reducing allocated

but unused storage you can eliminate stranded storage.

HP StorageWorks Dynamic Capacity Management

EVA software

HP StorageWorks Dynamic Capacity Management EVA

software continuously monitors user-set thresholds and

automatically grows or shrinks the storage/host volumes

to map data resources to actual data needs within the

HP StorageWorks EVA. You can also manually grow

and shrink volumes if needed.

The road ahead

So where do go from here, and what lies ahead on

the power and cooling horizon? Based on current

issues and trends, here is some of what we expect

in the road ahead.

7

Figure 3. Cutting costs, saving

energy

Here is a look at the potential

impacts of the use of best

practices, tuning and closely

coupled cooling solutions in a

typical data center.

10

Potential impact of best practices, CFD and closely coupl ed solutions on a typical data center

Energy savings potential for many data centers

10 0 %

80%

60%

40%

20%

0%

PUE=3.0

typical

PUE=2.4

best

practices

PUE=2.0

CFD

PUE=1.6

closely

coupling

Energy savings

Cooling

Power

IT

Potential increase in IT equipment with no additional energy use

10 0 %

80%

60%

40%

20%

0%

PUE=3.0

Typical

PUE=2.4

best

practices

PUE=2.0

CFD

PUE=1.6

closely

coupling

Cooling

Additional IT

Power

IT

Optimization can delay building

another costly data center

Optimization can make significant

impact to profit margin

25% 50% 88%

21 % 3 3 % 47 %

Malone, C., C. Belady, “Metrics to characterize Data Center and IT Equipment Energy Use,” Proceedings of 2006 Digital Power Forum, Richardson, Texas (September 2006)

Integrated power and cooling management

Companies are going to work actively to achieve the

seamless integration and management of power, cooling

and compute resources. HP Labs is currently doing a

substantial amount of work in this area. The ultimate goal

is to optimize the complete data center ecosystem in a

manner that allows diverse technology components to

work together in a more energy efficient manner.

The widespread use of metrics

We also expect to see broad adoption of industry metrics

for data center power and cooling efficiency and for

server efficiency. In the years ahead, metrics will likely be

widely used for benchmarking purposes. These will

include new metrics from the Standard Performance

Evaluation Corporation (SPEC) benchmarking body.

Increasing commoditization

The years ahead will bring increasing commoditization

of the data center. The data center of the future is likely

to be filled with plug-and-play equipment. Companies

will strive to deploy servers that are designed to the

same environmental specifications. This trend is already

under way, in the form of emerging industry guidelines

from organizations such as ASHRAE. These wide-ranging

guidelines attempt to define standard data center

environments and configurations, all the way down

to target environmental temperatures and humidity

specifications for servers and facilities.

The rise of new cooling technologies

We expect to see the emergence of new technologies

that allow cooling capacity to be more closely targeted

at heat sources. These will include liquid cooling

technologies that allow cooling solutions to be placed

inside server racks for higher levels of efficiency.

An emphasis on sustainable computing

For companies around the world, the years ahead

will require an increasing emphasis on sustainable

computing practices that help reduce power consumption

and cut operational costs. This focus on energy conser

-

vation isn’t just about saving money and stemming the

dramatic increases in power and cooling costs. This is

just as much about reducing the consumption of natural

resources and the release of C0

2

emissions.

With the use of natural resources and greenhouse

emissions increasing every year, it’s no surprise that

enterprises around the world face a growing range of

environmental regulations—and a growing realization

that the status quo has to change. In enterprise environ

-

ments, the future is likely to bring a constant focus on

energy conservation and sustainable computing practices.

Creating an energy-efficient data center

Power and cooling isn’t just your problem. It’s an

industry problem, a technology problem and a global

environmental problem.

The technology industry is responding. Across the

industry, new technologies and new initiatives are

emerging to address power and cooling issues. These

efforts will allow your organization to take greater

advantage of the next generation of server and

storage technologies.

At HP, we are taking a leadership role in helping

organizations like yours address your power and

cooling challenges. We’re driving energy-efficiency

initiatives. We’re working with industry partners to

leverage innovative energy-aware technologies that

put control of energy usage back into the hands of

data center managers. We’re researching, designing

and developing new solutions to address future IT needs.

Ultimately, these diverse efforts come down to a narrow

point of focus: At HP, we want to help your organization

create an energy-efficient data center that allows you to

control costs, conserve energy, cut your carbon footprint

and achieve sustainable business outcomes.

To learn more

To learn more about data center power and cooling

solutions, visit: www.hp.com/go/energyefficiency.

To learn more, visit www.hp.com/go/energyefficiency

© Copyright 2007 Hewlett-Packard Development Company, L.P. The information contained herein is subject to

change without notice. The only warranties for HP products and services are set forth in the express warranty

statements accompanying such products and services. Nothing herein should be construed as constituting an

additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

4AA1-4756ENW, September 2007