133248 20240410085328.0 doi 10.1109/TNSM.2022.3147146 sideral 137878 ART-2022-137878 eng Ortin, Jorge (orcid)0000-0001-9052-9554 Analysis of Scaling Policies for NFV Providing 5G/6G Reliability Levels With Fallible Servers 2022 The softwarization of mobile networks enables an efficient use of resources, by dynamically scaling and re-assigning them following variations in demand. Given that the activation of additional servers is not immediate, scaling up resources should anticipate traffic demands to prevent service disruption. At the same time, the activation of more servers than strictly necessary results in a waste of resources, and thus should be avoided. Given the stringent reliability requirements of 5G applications (up to 6 nines) and the fallible nature of servers, finding the right trade-off between efficiency and service disruption is particularly critical. In this paper, we analyze a generic auto-scaling mechanism for communication services, used to de(activate) servers in a cluster, based on occupation thresholds. We model the impact of the activation delay and the finite lifetime of the servers on performance, in terms of power consumption and failure probability. Based on this model, we derive an algorithm to optimally configure the thresholds. Simulation results confirm the accuracy of the model both under synthetic and realistic traffic patterns as well as the effectiveness of the configuration algorithm. We also provide some insights on the best strategy to support an energy-efficient highly-reliable service: deploying a few powerful and reliable machines versus deploying many machines, but less powerful and reliable. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/DGA/T31-20R info:eu-repo/grantAgreement/ES/MCIU-ERDF/RTI2018-099063-B-I00 info:eu-repo/grantAgreement/ES/UZ/CUD2021-11 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 5.3 2022 COMPUTER SCIENCE, INFORMATION SYSTEMS 49 / 158 = 0.31 2022 Q2 T1 1.693 2022 Electrical and Electronic Engineering 2022 Q1 Computer Networks and Communications 2022 Q1 7.6 2022 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Serrano, Pablo Garcia-Reinoso, Jaime Banchs, Albert 19, 2 (2022), 1287-1305 IEEE Transactions on Network and Service Management IEEE Transactions on Network and Service Management 1932-4537 12908827 http://zaguan.unizar.es/record/133248/files/texto_completo.pdf Postprint 3381226 http://zaguan.unizar.es/record/133248/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:133248 articulos driver 2024-04-10-08:37:15 ARTICLE