scholarly journals Scalable Monitoring and Optimization Techniques for Megascale Data Centers

2016 ◽  
Vol 34 (8) ◽  
pp. 1980-1989
Author(s):  
Markos P. Anastasopoulos ◽  
Anna Tzanakaki ◽  
Dimitra Simeonidou
Keyword(s):  
Data Centers ◽  
Optimization Techniques ◽  
Scalable Monitoring

scholarly journals TAPO: Thermal-aware power optimization techniques for servers and data centers

2011 ◽  
Author(s):  
Wei Huang ◽  
Malcolm Allen-Ware ◽  
John B. Carter ◽  
Elmootazbellah Elnozahy ◽  
Hendrik Hamann ◽  
...  
Keyword(s):  
Data Centers ◽  
Power Optimization ◽  
Optimization Techniques

Performance Analysis for Pareto-Optimal Green Consolidation Based on Virtual Machines Live Migration

2017 ◽  
Vol 9 (4) ◽  
pp. 36-56
Author(s):  
Chetan Dhule ◽  
Urmila Shrawankar
Keyword(s):  
Data Centers ◽  
Virtual Machines ◽  
Energy Requirement ◽  
Optimal Solution ◽  
Optimization Techniques ◽  
Pareto Optimal ◽  
Live Migration ◽  
Main Challenge ◽  
Prime Concern ◽  
Vm Consolidation

Huge energy requirement of cloud data centers is prime concern. Dynamic Virtual Machine (VM) consolidation based on VM live migration to switched-off or put some of the under-loaded host Physical Machines (PMs) into a low power consumption mode can significantly save energy in data centers and achieve green cloud computing. Performance overheads imposed on source and destination hosts during and after VM live migration is the main focus of research. Existing VM consolidation approaches are inefficient regarding VM live migration time, application downtime, VM pre and post-migration overheads which results in Quality of Service (QoS) degradation. So, near-optimal solution which optimizes these overheads is main challenge. This paper discusses the causes of VM live migration performance overheads and comparison of different overhead optimization techniques on the basis of parameters like accuracy and migration cost. Pareto-Optimal solution is proposed to eliminate the VM performance overheads.

A Comparison of Parametric and Multivariable Optimization Techniques in a Raised-Floor Data Center

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Srinarayana Nagarathinam ◽  
Babak Fakhim ◽  
Masud Behnia ◽  
Steve Armfield
Keyword(s):  
Data Center ◽  
Air Conditioning ◽  
Data Centers ◽  
Parametric Optimization ◽  
Flow Distribution ◽  
Optimization Procedure ◽  
Optimization Techniques ◽  
Maximum Temperature ◽  
Response Surface Optimization ◽  
Ceiling Height

It is well known that the flow distribution in data centers can be effected by a variety of parameters such as rack and computer room air conditioning (CRAC) positions, raised-floor height, ceiling height, and percentage opening of perforated tiles. In the present paper, numerical simulations are conducted to optimize the layout of a raised-floor data center with respect to these parameters. Two different approaches have been used: parametric optimization; and a multivariable approach using response surface optimization. In the parametric optimization procedure, the data center is optimized with respect to the maximum temperature in the room. While in the multivariable approach, a cost function is constructed from all the rack inlet temperatures and is minimized. The results show that the multivariable approach is computationally economical and the optimized layout gives a better thermal performance compared to that of parametric optimization.

Queuing Model Based Data Centers: A Review

2019 ◽  
Vol 123 ◽  
pp. 11-20 ◽  
Author(s):  
N. Thirupathi Rao ◽  
Debnath Bhattacharyya ◽  
S. Naga Mallik Raj
Keyword(s):  
Data Centers ◽  
Queuing Model ◽  
Model Based

Review on the aerodynamics of intermediate compressor duct

2020 ◽  
Vol 14 (4) ◽  
pp. 7446-7468
Author(s):  
Manish Sharma ◽  
Beena D. Baloni
Keyword(s):  
High Pressure ◽  
Pressure Loss ◽  
Flow Analysis ◽  
Outer Wall ◽  
Optimization Techniques ◽  
Optimum Pressure ◽  
Research Areas ◽  
Static Pressure Distribution ◽  
High Pressure Compressor ◽  
Pressure Compressor

In a turbofan engine, the air is brought from the low to the high-pressure compressor through an intermediate compressor duct. Weight and design space limitations impel to its design as an S-shaped. Despite it, the intermediate duct has to guide the flow carefully to the high-pressure compressor without disturbances and flow separations hence, flow analysis within the duct has been attractive to the researchers ever since its inception. Consequently, a number of researchers and experimentalists from the aerospace industry could not keep themselves away from this research. Further demand for increasing by-pass ratio will change the shape and weight of the duct that uplift encourages them to continue research in this field. Innumerable studies related to S-shaped duct have proven that its performance depends on many factors like curvature, upstream compressor’s vortices, swirl, insertion of struts, geometrical aspects, Mach number and many more. The application of flow control devices, wall shape optimization techniques, and integrated concepts lead a better system performance and shorten the duct length.  This review paper is an endeavor to encapsulate all the above aspects and finally, it can be concluded that the intermediate duct is a key component to keep the overall weight and specific fuel consumption low. The shape and curvature of the duct significantly affect the pressure distortion. The wall static pressure distribution along the inner wall significantly higher than that of the outer wall. Duct pressure loss enhances with the aggressive design of duct, incursion of struts, thick inlet boundary layer and higher swirl at the inlet. Thus, one should focus on research areas for better aerodynamic effects of the above parameters which give duct design with optimum pressure loss and non-uniformity within the duct.

Cooling Technologies Using Outside Air Economizers for Data Centers

2011 ◽  
Vol 131 (7) ◽  
pp. 424-428
Author(s):  
Masahide YANAGI ◽  
Yosuke UDAGAWA ◽  
Shisei WARAGAI
Keyword(s):  
Data Centers

Malfunction Issue of SiC-SIT Based DC Circuit Breaker in 400V DC Power Distribution Systems for Data Centers

2012 ◽  
Vol E95.B (6) ◽  
pp. 1990-1996
Author(s):  
Seiya ABE ◽  
Sihun YANG ◽  
Masahito SHOYAMA ◽  
Tamotsu NINOMIYA ◽  
Akira MATSUMOTO ◽  
...  
Keyword(s):  
Power Distribution ◽  
Distribution Systems ◽  
Data Centers ◽  
Circuit Breaker ◽  
Power Distribution Systems ◽  
Dc Power ◽  
Dc Circuit Breaker
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