On Thu, Aug 2, 2018 at 3:36 AM Benjeman Meekhof <bmeekhof@xxxxxxxxx> wrote: > > 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. > That statement is no longer correct. what are output of "ceph daemon mds.x dump_mempools" and "ceph tell mds.x heap stats"? > thanks, > Ben > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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