Hi, we consider upgrading a production system from Lustre 2.1.6 to 2.5.1. According to some recent conversation here, it seems this should be done via version 2.4.2. Is this correct? I am worried about the safety of the data. Is this upgrade path now a well-tested procedure known to work? Or shouldn't this be done with important data? Best, Oliver Mangold -- Dr. Oliver Mangold System Analyst NEC Deutschland GmbH HPC Division Hessbrühlstraße 21b 70565 Stuttgart Germany Phone: +49 711 78055 13 Mail: oliver.mangold(a)emea.nec.com