Fifteen of the top 100 systems in the world are IBM Blue Gene (BG) systems. These systems are large and complex and offer unique challenges to the system administrators who run them. This BOF will be an opportunity for the administrators of BG systems to share information and discuss some of the problems that keep them awake at night. There will be presentations from multiple Blue Gene sites, covering topics such as fault analysis techniques and locally developed administration tools. There will also be a panel of experts from Argonne National Laboratory, Juelich Research Centre, Lawrence Livermore National Laboratory, IBM, and Stony Brook University, who will discuss their configurations and present their top 5 issues. Members of the audience will have the opportunity to ask questions of the panel and share their own top issues and tools.