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HP ML150 Optimizing facility operation in high density data center environment - Page 16

Electrical and network cables from devices in the racks pass through cutouts in the tile floor

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Figure 9. Unorganized cables (left) and organized cables (right) beneath a raised floor. Electrical and network cables from devices in the racks pass through cutouts in the tile floor to wireways and cable trays beneath the floor. Oversized or unsealed cable cutouts allow supply air to escape from the plenum, thereby reducing the static pressure. Self-sealing cable cutouts are required to maintain the static pressure in the plenum (Figure 10). Cable management in high-density sever environments can significantly affect cooling issues.7 Figure 10. Self-sealing cable cutout in 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

Section	Page
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
High-line power efficiency	7
Power management and reporting of individual servers	8
Server virtualization using virtual machine technology	9
Efficient practices at the rack level	9
Rack configuration tools	9
Methods for calculating power supply requirements	10
Power protection and management	10
Rack based power distribution	10
High-efficiency power supplies	10
Understanding Internal airflow	10
Liquid cooled racks	11
Efficient practices for facility-level power and cooling	12
Power management and reporting	13
Comprehensive management applications	13
Power Capping	13
Airflow distribution for high-density data centers	13
Raised floors	15
Air supply plenum	15
Ceiling return air plenum	17
Dual supply air plenums	17
Perforated tiles	17
Rack geometry	18
Cooling footprint	18
Hot and cold aisle spacing	18
Row configuration	18
Closely coupled cooling	19
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

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Figure 9.

Unorganized cables (left) and organized cables (right) beneath a raised floor.

Electrical and network cables from devices in the racks pass through cutouts in the tile floor to

wireways and cable trays beneath the floor. Oversized or unsealed cable cutouts allow supply air to

escape from the plenum, thereby reducing the static pressure. Self-sealing cable cutouts are required

to maintain the static pressure in the plenum (Figure 10). Cable management in high-density sever

environments can significantly affect cooling issues.

Figure 10.

Self-sealing cable cutout in raised floor

For more information about cable management, see the technology brief titled “Cable management for rack-

mounted systems,”

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01085208/c01085208.pdf