Hi Venky, thank you for your help. We managed to shut down mds.1: We set "ceph fs set max_mds 1" and waited for about 30 minutes. In the first couple minutes, strays were migrated from mds.1 to mds.0. After this, the stray export hung. The mds.1 remained in the state_stopping. After about 30 minutes, we restarted mds.1. This resulted in one active mds and two standby mds. However, we are not sure, if the remaining strays could be migrated. When we had a closer look at the perf counter of the mds, we realized that the number of strays_enqueued is quite high and constantly increasing. Is this to be expected? What does the counter "strays_enqueued" mean in detail? ceph daemon mds.0 perf dump | grep stray "num_strays": 49846, "num_strays_delayed": 21, "num_strays_enqueuing": 0, "strays_created": 2042124, "strays_enqueued": 2396076, "strays_reintegrated": 44207, "strays_migrated": 38, Would it be safe to perform "ceph orch upgrade resume" at this point? At the moment, the MONs and OSDs are running 17.2.6, while the MDSs and RGWs are running 17.2.5. So we have to upgrade the MDS and RGW eventually. Best, Tobias