The activity of public institutions and local authorities requires the deployment of a large volume of IT resources and hosting and communication capacity (calculation, storage and processing of data, collaborative services, exchanges of large volumes of data...). Facing a common problem, based on their experience in the field, wishing to modernise, optimise, secure and anticipate the obsolescence of their current IT hosting infrastructures, the CHRU of Nancy, the University of Lorraine and the Greater Nancy Metropolis, have decided to pool their infrastructures within a single Datacenter: the Lorrain Mutualised Datacenter (DCML). The DCML will incorporate a shared room dedicated to scientific calculation.