HP ProLiant DL185 Dynamic Power Capping TCO and Best Practices White Paper (WW - Page 3

Dynamic Power Capping Reclaims Trapped Power Capacity, By using Dynamic Power Capping

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According to the Green Grid, "the cost of power and cooling the IT infrastructure approaches and even exceeds the cost of acquiring the assets themselves."2 This increase in cost has captured the attention of the CIO, and many organizations are now being asked to find creative ways to reduce power consumption and better utilize existing facilities while maintaining or improving the quality of IT service delivery. Faced with half-filled racks, a lack of power and cooling capacity and no budget to increase capacity, IT organizations and their facilities counterparts are forced to abandon traditional power-budgeting techniques, such as budgeting to power supply faceplate levels. They must find more precise ways to measure actual power requirements and the means to control the power that those devices consume. Dynamic Power Capping Reclaims Trapped Power Capacity The Thermal Logic portfolio of products and technology provides an answer to the dilemma posed by increasing data center power and cooling costs. First, HP energy-efficient servers deliver maximum performance per watt, helping reduce the amount of power required to deliver IT services. Also, starting in mid-December, 2008, HP will deliver Dynamic Power Capping, a solution that allows systems administrators to reclaim trapped power and cooling capacity by safely limiting the amount of power consumed by one or more ProLiant servers or HP BladeSystem c7000 enclosures without impacting server performance. Figure 1 illustrates the benefit of Dynamic Power Capping. Power consumption of IT equipment within the data center is represented by the curve at the bottom of the diagram. The amount of power consumed will vary over time as workload intensity varies. The amount of power budgeted for the same equipment is represented by the "Allocated power capacity (per faceplate)" or "Allocated power capacity (per power calculator)" lines. The "Actual peak power usage" line represents the maximum power used by equipment in the data center over time. By using Dynamic Power Capping and setting server or blade enclosure power caps to the actual peak power usage, IT departments are able to reclaim the amount of power capacity represented by the distance between the allocated power capacity lines and the actual peak power usage line. Companies that currently budget to faceplate will see the greatest power-capacity benefit. Companies that budget power using tools such as the HP Power Calculator also stand to reclaim significant power capacity. By setting the Dynamic Power Cap at the actual peak-power usage, power is reclaimed without impacting performance. 2 The Green Grid, "The Green Grid Opportunity Decreasing Datacenter and Other IT Energy Usage Patterns," February 2007. 3

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According to the Green Grid, “the cost of power and cooling the IT infrastructure approaches and
even exceeds the cost of acquiring the assets themselves.”
2
This increase in cost has captured the
attention of the CIO, and many organizations are now being asked to find creative ways to reduce
power consumption and better utilize existing facilities while maintaining or improving the quality of
IT service delivery.
Faced with half-filled racks, a lack of power and cooling capacity and no budget
to increase capacity, IT organizations and their facilities counterparts are forced to abandon
traditional power-budgeting techniques, such as budgeting to power supply faceplate levels.
They
must find more precise ways to measure actual power requirements and the means to control the
power that those devices consume.
Dynamic Power Capping Reclaims Trapped Power
Capacity
The Thermal Logic portfolio of products and technology provides an answer to the dilemma posed by
increasing data center power and cooling costs.
First, HP energy-efficient servers deliver maximum
performance per watt, helping reduce the amount of power required to deliver IT services. Also,
starting in mid-December, 2008, HP will deliver Dynamic Power Capping, a solution that allows
systems administrators to reclaim trapped power and cooling capacity by safely limiting the amount
of power consumed by one or more ProLiant servers or HP BladeSystem c7000 enclosures without
impacting server performance.
Figure 1 illustrates the benefit of Dynamic Power Capping.
Power consumption of IT equipment within
the data center is represented by the curve at the bottom of the diagram.
The amount of power
consumed will vary over time as workload intensity varies.
The amount of power budgeted for the
same equipment is represented by the “Allocated power capacity (per faceplate)” or “Allocated
power capacity (per power calculator)” lines.
The “Actual peak power usage” line represents the
maximum power used by equipment in the data center over time.
By using Dynamic Power Capping
and setting server or blade enclosure power caps to the actual peak power usage, IT departments are
able to reclaim the amount of power capacity represented by the distance between the allocated
power capacity lines and the actual peak power usage line.
Companies that currently budget to
faceplate will see the greatest power-capacity benefit.
Companies that budget power using tools such
as the HP Power Calculator also stand to reclaim significant power capacity.
By setting the Dynamic
Power Cap at the actual peak-power usage, power is reclaimed without impacting performance.
2
The Green Grid, "The Green Grid Opportunity Decreasing Datacenter and Other IT Energy Usage Patterns," February 2007.
3