Hi Ceph fs'ers I have a question about the "mds_cache_memory_limit" parameter and MDS memory usage. We currently have set mds_cache_memory_limit=150G. The MDS server itself (and its active-standby) have 256 GB of RAM. Eventually the MDS process will consume ~ 87.5% of available memory. At that point it will trim its cache, confirmed with: while sleep 1; do ceph daemon mds.mds1 perf dump | jq '.mds_mem.rss'; ceph daemon mds.mds1 dump_mempools | jq -c '.mds_co'; done 1 cephfs kernel client (4.13.0-21-generic), Ceph 12.2.2. Anyways, it will consume roughly 1.5 times the amount of memory it is allowed to use according to mds_cache_memory_limit. Is this expected behaviour? Gr. Stefan -- | BIT BV http://www.bit.nl/ Kamer van Koophandel 09090351 | GPG: 0xD14839C6 +31 318 648 688 / info@xxxxxx _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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