Cost reduction evaluation of sharing backup servers in inter-cloud

Backup servers are effective for maintaining the high availability of cloud services against hardware failures and disasters. For reducing additional costs, the backup servers are shared in the same cloud system. For achieving much more efficient sharing of backup servers to reduce the cost, we focus on the Inter-cloud which enables the sharing of computing resource among multiple cloud systems dynamically. In this paper, we propose a scheme to share backup servers in the Inter-cloud. To evaluate the cost reduction effect of this scheme, we design a model for calculating the optimal number of backup servers and assume several domains of applicability. Based on the calculation results, when each cloud system has 10000 running servers and 100 cloud systems collaborate together for disaster recovery, the proposed scheme can reduce the number of servers for every cloud system from 10000 to 200.