Add to ORKGLots of scientific applications use and create vast amounts of data. Those often have specific ways to access data in non-sequential patterns (strided requests). To avoid performance loss, parallel I/O libraries such as ROMIO are often used to aggregate small separate requests into large contiguous ones. However, optimizations for a given applications are not aware of the whole set of interactions with other ones running at the same time on the cluster. As a consequence, most of the optimization work is lost because they will be disturbed by the other applications !This document presents a software service, named aIOLi, whose role is to control, reschedule and regulate the whole set of interactions coming from all applications running simul...