Even though modern Internet bandwidth allows for the computing power to be located anywhere and still receive in quasi-realtime the interferometer signal amounting to a few kilobytes per second, many tasks, such as the validation of the event candidates against the status of the interferometer require to access a lot of additional data at the detector site itself ( additional acquisition channels ) performing computations in the order of minutes. To this end, including two on-line data analysis pipelines residing on-site, a computing farm of about 1200 physical cores, accessing more than 2PB of data runs continuously in the EGO Datacenter, mainly on linux virtual machines. And since the gravitational waves detectors are “observatories” the IT infrastructure needs to be active h24x7. In addition EGO works as a research institute aiming at spreading and fostering the research on the gravitational waves at the european level while the Virgo Collaboration, as a virtual collaboration of groups from many nations, has its central repository of information at the EGO site. This makes Cascina the pivotal site of activity for the Gravitational Waves science in Europe and the IT infrastructure hosts all the workplaces, personal productivity tools, documentation, web, meeting systems, etc. to let this happen. The current IT infrastructure generation has been developed from 2013 to 2017 for the Advanced Virgo detector era, which, together with LIGO, provided the historical discoveries of gravitational waves events since 2017. The network is based on a LAN backbone of 2×10 Gbps all over the 3km+3km site extension connected to the Datacenter core spine-leaf fabric with multiples of 2×40 Gbps links insuring at least 5Gbps of bandwith to each computing node in the worst conditions. On top of that a virtualization layer has been setup using mainly Citrix XenServer hypervisors plus VMware and HyperV hosts, all running on high density physical blade servers with various generation of Intel processors. The storage system, running through an iSCSI SAN on the same converged network infrastructure, is made of various arrays with different capabilities ranging from the few TB on-line buffers for the writing of Data Acquisition to the multi-PB repository serving on-line the data from the whole last year supporting the interferometer development. The data for the Virgo scientific activities are served either through memory-to-memory network trasmission to the cluster of linux standalone servers for the fast processing or via NFS to the HTCondor farm for jobs with less stringent time requirements. Both for the generals scientific activity and the personal productivity virtual workstations are provided In VDI mode as linux or windows desktops, reachable via thin clients spread on the site or accessible remotely by authenticated users. Finally, the site is connected to the Internet via a 10Gbps fibre link reaching the Pisa metropolitan area network 20km far away. Through this link flows the continuous data transfer mirroring the produced Virgo data of about 1PB per year to the Datacenters for long-term archiving and off-line data analysis, but also the exchange of data with the LIGO detectors or with the INGV seismic network.