Dr Daniel van der Ster (CERN) Dr Jakub Moscicki (CERN)
AFS is a mature and reliable storage service at CERN, having worked for more than 20 years as the provider of Linux home directories and application areas. Recently, our AFS service has been growing at unprecedented rates (300% in the past year), thanks to innovations in both the hardware and software components of our file servers. This work will present how AFS is used at CERN and how the service offering is evolving with the increasing storage needs of its local and remote user communities. In particular, we will demonstrate the usage patterns for home directories, workspaces and project spaces, as well as show the daily work which is required to rebalance data and maintaining stability and performance. Finally, we will highlight some recent changes and optimisations made to the AFS Service, thereby revealing how AFS can possibly operate at all while being subjected to frequent — almost DDOS-like — attacks from its users.