The activity of public institutions and local and regional authorities requires the deployment of a large volume of IT resources, hosting and communication capacity (calculation, data storage and processing, collaborative services, exchanges of large volumes of data, etc.). Faced with a common problem, with their experience in the field, wishing to modernise, optimise, secure and anticipate the obsolescence of their current IT hosting infrastructures, the CHRU Nancy, the University of Lorraine and the Métropole du Grand Nancy, have decided to pool their infrastructures within a single Datacenter: the Datacenter Mutualised Lorrain (DCML).