Retrospective Scheduling of Elastic Bandwidth Reservations in LambdaGrids

Tfie ability to reserve network bandwidth is critical for the success of high-performance grid applications. While reservation of lightpaths in dynamically switched optical networks facilitates guaranteed bandwidth, it is also imperative to effectively schedule these bandwidth reservations so as to orchestrate workflows involving computational, storage, and network resources. However, reservation can often lead to bandwidth fragmentation which significantly reduces system utilization and increases the blocking probability of requests. In this paper, we present a dynamic bandwidth scheduling scheme which exploits the quasi-flexible nature of bandwidth reservations and mitigates the problem of bandwidth fragmentation in LambdaGrids