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HP ML150 Optimizing facility operation in high density data center environment - Page 23

An over-provisioned CRAC unit large negative percentage operates significantly below

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• 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 182 kW) for a combination of compute, storage, and networking equipment in a typical raised floor data center with four CRAC units. The CFD model shows that the provisioning of the CRAC units is completely out of balance. Figure 18. Poorly provisioned CRAC units 23

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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•

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 182 kW) for a

combination of compute, storage, and networking equipment in a typical raised floor data center with

four CRAC units. The CFD model shows that the provisioning of the CRAC units is completely out of

balance.

Figure 18.

Poorly provisioned CRAC units