Failure-Resilient Server Allocation Model with Single-Database Connectivity for Delay-Sensitive Internet-of-Things Monitoring

This letter proposes a distributed server allocation model with single-database connectivity for delay-sensitive Internet-of-Things monitoring services. Based on preventive start-time optimization against server failure, it minimizes the maximum transmission delay across all failure scenarios. Unlike the conventional two-database connectivity model, which restricts application server placement, the proposed model allows connection to a single database server, expanding allocation flexibility. Numerical results show that the proposed model reduces the maximum delay under server failure by up to 10.7% in our examined cases compared to the conventional model.