I've been encountering lately a much higher than expected memory usage on our MDS which doesn't align with the cache_memory limit even accounting for potential over-runs. Our memory limit is 4GB but the MDS process is steadily at around 11GB used.
Coincidentally we also have a new user heavily relying on hard links. This led me to the following (old) document which says "Hard links are also supported, although in their current implementation each link requires a small bit of MDS memory and so there is an implied limit based on your available memory. " (https://ceph.com/geen-categorie/cephfs-mds-status-discussion/) Is that statement still correct, could it potentially explain why our memory usage appears so high? As far as I know this is a recent development and it does very closely correspond to a new user doing a lot of hardlinking. Ceph Mimic 13.2.1, though we first saw the issue while still running 13.2.0. thanks, Ben _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
