Unified Thermal and Power Management in Server Enclosures

Author(s):  
Niraj Tolia ◽  
Zhikui Wang ◽  
Parthasarathy Ranganathan ◽  
Cullen Bash ◽  
Manish Marwah ◽  
...  

Improving the cooling efficiency of servers has become an essential requirement in data centers today as the power used to cool the servers has become an increasingly large component of the total power usage. Unfortunately, most previous approaches have individually focused on reducing either the server power or the power used by the fans to cool the servers. This paper presents Zephyr, a systems approach to managing fan power that combines conventional server power optimizations with fan power management to optimize overall energy efficiency. By combining distributed system design with concepts from heat transfer theory, Zephyr can reduce cooling power by up to 21% when compared to a feedback-based controller and up to 30% when combined with cooling-aware workload migration policies. Overall, the combined Zephyr system can reduce total system power by up to 29% without impacting application performance.

2021 ◽  
Vol 1 (48) ◽  
pp. 257-269
Author(s):  
Poliakov V ◽  
◽  
Yaschenko D ◽  
Sharai S ◽  
◽  
...  

In article the question at the choice of the rolling stock of passenger motor transport in the BRT system which provides movements of buses on specially allocated and often obgorodzheny strips, that is its full isolation on the road from other means of transport is considered. For increase in passenger capacity in the BRT system use three-link buses and trolleybuses. Along with indisputable advantages of three-link buses and trolleybuses also shortcomings - the worst maneuverability and stability of the movement in comparison with two-link are inherent in them. Besides, the efficiency of operation of such cars is provided with a passenger traffic which during the day can change many times. Therefore the road train as a part of two (or three) the buses or trolleybuses working in connection, і which passenger capacity similar to the jointed buses and trolleybuses can become perspective. In rush hours the bus train, and in interpeak the period - each bus separately works (the possible parking of one bus at allocated to the platform). In view of restriction of the maximum length of the bus train at the level of 24.26 m, as buses as making road trains, we will accept the 8th meter buses MAZ 206. Passenger capacity of such bus is 72 passenger, the power of the traction engine - 160 kW. The expediency of use of three-link hook-on road train is proved by the conducted researches that MAZ 206 with a total length up to 26 m and with a passenger capacity up to 220 passengers in the BRT system consists of three same buses. It is shown that the total power of engines is necessary for the movement of such bus train with a speed of 25 m/s has to make 300 kW while for one bus at the movement with the same speed it has to be at the level of 135 kW. It demonstrates about economic feasibility of use of the bus train from three buses working in connection because for their movement in all range of speeds there is enough power of two engines, that is one of buses can be used as the passive trailer that will lead to improvement of fuel profitability of the bus train. It is established that on maneuverability indicators three links the hook-on road train considerably exceeds three links pivotally - the jointed bus. So, the dimensional lane of the hook-on bus train at execution of the most typical maneuvers by it during the work on a city route does not exceed 3.9 and 4.1 m at turns respectively on 900 and 1800 that it is much less, than for three links pivotally the jointed bus 24 m long respectively of 6.8 and 8.2 m. KEYWORDS: THREE-UNIT THE ROAD TRAIN, THE BUS, PIVOTALLY-THE JOINTED BUS, THE BRT SYSTEM, POWER, MANEUVERABILITY, A TRAJECTORY, OVERALL STRIP


Queue ◽  
2003 ◽  
Vol 1 (7) ◽  
pp. 66-72 ◽  
Author(s):  
Andrew Grover

Author(s):  
John H. Burgess

Psychological interactions among members of a systems design team are frequently of major importance in the design process. Problems arise from specialized design interests as well as failure in systems discipline. Such problems can be resolved only by understanding the nature of the individual and his involvement in interpersonal design conflicts. Several areas may be considered for improving interpersonal relations in the systems design effort. Through increasing emphasis on significance of systems design, greater personal and professional involvement in the systems approach may be possible. Attention is required at the corporate-management organization level to orient individual engineering professional goals in terms of total system perspective. Indoctrination and discipline in systems philosophy and practices also require increased emphasis. Comprehensive design-team training might be considered as a means for improving the systems design process. Further study is suggested.


2012 ◽  
Vol 21 (01) ◽  
pp. 1250003 ◽  
Author(s):  
WEIYIN HONG ◽  
XIN KUANG ◽  
JIANHUA SHEN ◽  
TONGQUAN WEI

With the increasing deployment of Wi-Fi devices in portable embedded systems, the low power design at system level has attracted considerable research attention in the recent past. In this paper, based on hardware features and software architecture of the embedded Wi-Fi devices, we focus on dynamic power management, dynamic frequency scaling, and their influences upon the system power and performance. We propose effective and realizable system power management solution and application modes under various application requirements, such as response, bandwidth, and speed. Experimental results show that the proposed solutions can achieve significant energy savings.


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