Compaq BL10e Optimizing facility operation in high density data center environ
Compaq BL10e - HP ProLiant - 512 MB RAM Manual
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- Compaq BL10e | Optimizing facility operation in high density data center environ - Page 1
Optimizing facility operation in high density data center environments technology brief Abstract...3 Introduction...3 Assessing facility requirements ...3 Using sizing tools to understand server and facility requirements 4 Data center assessment...5 Component power and cooling ...5 Processor power - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 2
Computer room air conditioners...19 Capacity of CRAC units ...19 Placement of CRAC units ...20 Discharge velocity ...21 Advanced thermal management techniques 22 Thermal Assessment Services ...22 Dynamic Smart Cooling ...24 Summary ...25 For more information...26 Call to action ...26 - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 3
data centers have had three major operational and fiscal constraints - power, cooling and space. As existing data centers are required to support increasingly dense configurations, power and cooling requirements can outstrip the capabilities of the data center infrastructures. In fact, the issue of - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 4
stressed to maximum capability. The HP StorageWorks Sizing Tool provides information for designing a storage infrastructure. This downloadable sizing tool applies storage design rules, licensing, and services rules to design the system. 4 - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 5
to project future requirements. IT administrators and data center managers should have access to methodologies and services designed to assess existing conditions, identify problems, and indicate solutions. HP Datacenter Thermal Assessment Services1 provide a thorough review and analysis of facility - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 6
P-state control at power-up, requires no software loading or upgrade, and can operate on systems running an OS that does not support P-state management. HP Power Regulator for ProLiant servers is an example of OSindependent, power management. This HP hardware/software implementation enables a system - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 7
can be found at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00816246/c00816246.pdf. High-line power efficiency In the -240V AC) for their servers. This is an important choice, since high-line service is the most stable, efficient, and flexible AC power for server and data operations - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 8
Figure 3. Power consumption of ProLiant DL380 G4 server at different AC supply levels 625 622 620 615 610 605 600 601 600 599 599 599 595 Watts AC 590 585 100 115 200 208 220 230 240 Volts AC Therefore, a 1000-server datacenter would save approximately $25,000 per year3 in direct and - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 9
online. With it, the user can choose servers, memory, operating system, storage, backup solution; configure power and cooling options; select appropriate software; and assign necessary services and support. This HP tool is available at: http://h30099.www3.hp.com/configurator/ 9 - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 10
UPS management modules can enable the administrator to monitor and manage power environments through comprehensive control of UPSes. Such modules can support either a single or multiple UPS configurations providing redundancy and no-single-point-of-failure. The management module can be configured to - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 11
must be installed in any open spaces in the front of the rack to support the front-to-back airflow design and prevent these negative effects. All rack retention products. Cable rings, trays, and trunking products will reduce problems associated with cooling, EMI, and cable damage. • Employ new - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 12
equivalent to that generated by three 10-kW racks, yet the MCS occupies 40 percent less floor space than three standard racks. Likewise, the MCS supports a heat load equivalent to 4.38 8kW racks (35 kW/8 kW per rack = 4.38 racks) while occupying 65 percent less floor space and reducing the overall - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 13
tool with these attributes is HP's Insight Power Manager (IPM). Insight Power Manager is a ProLiant Essentials product that is part of HP SIM Graphing. Analysis is supported for single-server or multiple-server views. The IPM product provides graphing and historical analysis of key power and thermal - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 14
plenum beneath the raised floor. The computer room air conditioning (CRAC) unit draws in warm air from the top, cools the air, and discharges it into the supply plenum beneath the floor. Figure 7. Airflow pattern for raised floor configuration with hot aisles and cold aisles To achieve an optimum - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 15
floors typically measure 18 inches (46 cm) to 36 inches (91 cm) from the building floor to the top of the floor tiles, which are supported by a grounded grid structure. The static pressure in the supply plenum pushes the air up through perforated floor tiles to cool the racks. Most equipment - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 16
raised floor 7 For more information about cable management, see the technology brief titled "Cable management for rackmounted systems," http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01085208/c01085208.pdf 16 - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 17
Ceiling return air plenum In recent years, raised floor computer rooms with very high heat density loads have begun to use a ceiling return air plenum to direct exhaust air back to the CRAC intake. As shown on the right of Figure 11, the ceiling return air plenum removes heat while abating the - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 18
in rack placement can change the fluid mechanics inside a data center and lead to inefficient utilization of CRAC units. See the "Thermal Assessment Services" section for more information. Cooling footprint The floor area that each rack requires must include an unobstructed area to draw in and - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 19
At the ends of rows, exhaust from the high-density rack will wrap around the end of the row infiltrating the cold aisle and device inlets. Deep into room corners, heat will be trapped in corner and eventually increase inlet temperatures (see Figure 14). Figure 14. Exhaust from the high-density rack - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 20
While the "tons" capacity rating is measured at 80˚F, HP recommends that facility managers target an optimal operating range of 68 - 77˚F and 40 - 55% relative humidity (RH). These ranges are in inline with the recommendations of the American Society of Heating, Refrigerating and AirConditioning - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 21
perimeter. Large, square rooms may require CRAC units to be placed around the perimeter and through the center of the room. Figure 16. CRAC units should be placed perpendicular to hot aisles so that they discharge cool air beneath the floor in the same direction. Discharge velocity To force air from - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 22
modeling to aid planners in designing the physical layout of the data center for optimum distribution of cooling resources and heat loads. These modeling services can also predict the changes in heat extraction of each CRAC unit when the rack layout and equipment heat load are varied. Dynamic Smart - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 23
• An over-provisioned CRAC unit (large negative percentage) operates significantly below the capacity of the unit. This results in wasted energy if operation of the unit cannot be adjusted to match the lower cooling load. For example, Figure 18 shows the row-wise distribution of heat loads (41 kW to - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 24
for retrofit in existing datacenters or can be easily specified as part of new construction. It is important to emphasize that the intelligent Strategies" technical brief available at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01153741/c01153741.pdf. 12 Patel, C.D., Sharma, R.K, Bash, - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 25
a room when certain equipment fails. As long as the data center has the power and cooling resources to support the expected loads, Thermal Assessment Services can rectify cooling problems as well as enhance the overall efficiency of air conditioning resources. In most cases, the energy savings alone - Compaq BL10e | Optimizing facility operation in high density data center environ - Page 26
/bc/docs/support/SupportMa nual/c01153741/c01153741.pdf Call to action Send comments about this paper to [email protected]. © 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
Optimizing facility operation in high density
data center environments
technology brief
Abstract
..............................................................................................................................................
3
Introduction
.........................................................................................................................................
3
Assessing facility requirements
..............................................................................................................
3
Using sizing tools to understand server and facility requirements
...........................................................
4
Data center assessment
.....................................................................................................................
5
Component power and cooling
.............................................................................................................
5
Processor power and cooling
............................................................................................................
5
Processor P-state
...........................................................................................................................
5
P-state management
......................................................................................................................
6
Efficient practices for servers and enclosures
.......................................................................................
6
Understanding server power utilization and heat generation
..............................................................
6
Greater density with multi-core processors
.......................................................................................
7
Blade enclosures with integrated cooling hardware
..........................................................................
7
Onboard thermal sensors and temperature management
...................................................................
7
Pooled power
..............................................................................................................................
7
High-line power efficiency
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7
Power management and reporting of individual servers
....................................................................
8
Server virtualization using virtual machine technology
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9
Efficient practices at the rack level
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9
Rack configuration tools
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9
Methods for calculating power supply requirements
........................................................................
10
Power protection and management
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10
Rack based power distribution
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10
High-efficiency power supplies
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10
Understanding Internal airflow
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10
Liquid cooled racks
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11
Efficient practices for facility-level power and cooling
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12
Power management and reporting
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13
Comprehensive management applications
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13
Power Capping
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13
Airflow distribution for high-density data centers
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13
Raised floors
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15
Air supply plenum
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15
Ceiling return air plenum
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17
Dual supply air plenums
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17
Perforated tiles
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17
Rack geometry
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18
Cooling footprint
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18
Hot and cold aisle spacing
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18
Row configuration
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18