Energy-aware joint management of Networks and Cloud Infrastructures IEEE Computer Networks 70 (2014) 75 95
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1 Energy-aware joint management of Networks and Cloud Infrastructures IEEE Computer Networks 70 (2014) Bernardetta Addis LORIA INRIA Nancy Grand Est Universite de Lorraine Giuliana Carello, Danilo Ardagna, Antonio Capone DEI, Politecnico di Milano Alta Scuola Politecnica Project Green Cloud
2 CLOUD CONSUMPTION About 0.5% of global electric power consumption is due to Data Centers (DC) In developed country: UK: % USA: 1.5% From the environmental point of view: 2% of global CO2 emissions % European IT consumption 2020 Cellular phone Network Telecom Network Server & Data Center ,0% 5,0% 10,0% 15,0% 20,0% 25,0% Source: EU Commission
3 ENVIRONMENTAL IMPACT Environmental impact and costs IT costs Number of Servers (M units) New Servers costs Energy and cooling costs Source: EU Commission High consumption, environmental impact and energy costs of Cloud Computing A way out: GREEN CLOUD COMPUTING
4 OUR APPROACH Green Cloud project: Exploiting different energy costs and different workload due to geographically distributed Data Centers Joint Data Center and network management Green energy sources utilization Integer Linear Programming Optimization models Scenario definition and analysis
5 SCENARIO Optimization over 24 hours Set of geographically distributed DCs Traffic profile for each Data Center over the day Possibility to redirect requests from one DC to another Fully connected network Energy cost for both DC and network NETWORK Request forwarding is due to: Lower energy cost Tradeoff between DC and network costs Available capacity
6 BROWN MODEL GIVEN The set of Data Centers: The set of request classes: The set of different type of servers: A planning horizon: Each request is originated by a given DC can be served only by some type of servers REDIRECTION VARIABLES: Requests rate (continuous variables) of the class k incoming to DC i served in DC j with a server of type l
7 BROWN MODEL CONSTRAINTS: REQUEST The whole incoming traffic has to be served Each request must be served by suitable server
8 BROWN MODEL CONSTRAINTS: REQUEST DATA CENTERS DCs can handle a finite number of requests Server have a utilization limit
9 BROWN MODEL CONSTRAINTS: REQUEST DATA CENTERS NETWORKS Links have limited bandwidth
10 BROWN MODEL CONSTRAINTS: REQUEST DATA CENTERS NETWORKS SWITCHING
11 BROWN MODEL CONSTRAINTS: REQUEST DATA CENTERS NETWORKS SWITCHING OBJECTIVE FUNCTION: Minimization of the costs over 24 hours Cost for operating servers Cost for switching on/off servers Bandwidth utilization Number of active link and link switching costs
12 GREEN MODEL ASSUMPTIONS: DCs can be powered through renewable sources: Solar Geothermic Wind Limited amount of green energy available Only autonomous production Minor cost with respect to brown energy sources
13 GREEN MODEL ASSUMPTIONS: DCs can be powered through renewable sources: Solar Geothermic Wind Limited amount of green energy available Only autonomous production Minor cost with respect to brown energy sources IMPLICATIONS: Green powered DCs are preferred CO2 reduction
14 GREEN MODEL ASSUMPTIONS: DCs can be powered through renewable sources: Solar Geothermic Wind Limited amount of green energy available Only autonomous production Minor cost with respect to brown energy sources IMPLICATIONS: Green powered DCs are preferred CO2 reduction
15 GREEN MODEL CONSTRAINTS: REQUEST DATA CENTERS NETWORKS SWITCHING GREEN ENERGY
16 Data Center locations DATA CENTER MAP
17 INCOMING TRAFFIC Starting from the basic profile: Re-scaling according to the geographical location Temporal shift to consider time zone differences Time band Analysis of the model behavior with respect to a growing number of incoming requests: billions of daily requests
18 /MWh ENERGY COST Differential trend according to: Energy market studies Geographical location Time band West USA East USA Europe Asia Time band
19 Location derived from green energy sources availability GREEN DATA CENTERS
20 kwh GREEN ENERGY AVAILABILITY Different trends and energy production according to the different green energy sources Analysis based on the dimension and location of the DCs Time bands Mountain View, CA - Solar power Seattle, WA - Geothermal power Frankfurt, GER - Wind power Sao Paolo, BRA - Solar power
21 POLICIES TO BE COMPARED Base Case: Requests execution in local Brown Model: Possibility of request redirection from one DC to another Green Model: Extension of the Brown Model taking into account green energy sources
22 Energy consumption (kwh/day) ENERGY CONSUMPTION Unfeasible solution BROWN MODEL vs GREY Model priority: minimizing expenses Higher energy consumption due to network utilization for request forwarding Base Brown 10% % % 7% Billions of daily requests
23 Energy expenses ( /day) EXPENSES REDUCTION BROWN MODEL vs GREY Base Brown 39% 37% Unfeasible solution % 39% Billions of daily requests
24 Energy expenses ( /day) EXPENSES REDUCTION GREEN MODEL vs GREY Base Green 43% 40% Unfeasible solution % 49% Billions of daily requests
25 Energy consumption (kwh) ENERGY CONSUMPTION REPARTITION Green energy saturation Possibility to better exploit the requests redirection by investing in green energy sources DC Green DC Brown Network Billions of daily requests
26 CO2 emissions (tons/day) CO 2 EMISSIONS Comparison of brown and green models based on the CO 2 emissions Maximum amount of green energy availability fixed at 8% Brown Green 8% 7% % % 41% Billions of daily requests
27 CONCLUSIONS ECONOMICAL POINT OF VIEW: Optimization of Network and DCs jointly Expenses reduction up to 40% ENVIRONMENTAL POINT OF VIEW: Reduction of greenhouse gas emissions Optimizing costs linked to the Carbon Credit system Promoting the use of green energy sources
28 FUTURE DEVELOPMENT The model proved to be: Robust, flexible and scalable POSSIBLE EXTENSIONS: Non fully connected network topology Service Level Agreement considerations and response time Tests on larger instances
29 ANY QUESTIONS? THANK YOU FOR THE ATTENTION!!!
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