In the progressive disaster scenario where multiple nodes and links are sequentially disrupted with different early warning times, real-time data backup is a critical concern to improve the survivability of a geo-distributed DCN (Geographically distributed Data Center Network). We consider this problem by assuming that different disaster-covered DCN nodes and links have different early warning times and different disaster-covered DCN nodes have distinct sets of backup nodes. Based on integer linear program (ILP), we first propose an optimal data backup scheme to maximize the total amount of data backup. This theoretically provides an upper bound on the total amount of data backup. Then, a heuristic (i.e., Amount-Based Algorithm) is developed to provide a time-efficient solution, in which an adjusting factor is introduced to deal with link bandwidth competitions among multiple disaster-covered DCN nodes. Furthermore, we give another way to increase the amount of data backup for DCN operators by adjusting the bandwidth distribution on the key link which is identified as the one that has the greatest impact on data backup. The extensive numerical results validate the proposed solutions under the progressive disaster scenario with different early warning times for different nodes and links.
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This work was supported by the National Natural Science Foundation of China (No. 61702068), the Key Project of Anhui University Science Research (No. KJ2020A0718) and 2018 Project of Anhui Provincial Department of Human Resources and Social Security for the Returned Overseas Chinese Scholars (No. 201815).
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Ma, L., Su, W., Wu, B. et al. Real-time data backup in Geo-distributed data center networks against progressive disaster. Photon Netw Commun 41, 211–221 (2021). https://doi.org/10.1007/s11107-021-00940-0
- Data center networks
- Data backup
- Progressive disaster
- Key link