On Tue, Sep 6, 2022 at 11:29 AM Vladimir Brik <vladimir.b...@icecube.wisc.edu> wrote: > > > What problem are you actually > > trying to solve with that information? > I suspect that the mds_cache_memory_limit we set (~60GB) is > sub-optimal and I am wondering if we would be better off if, > say, we halved the cache limits and doubled the number of > MDSes. I am looking for metrics to quantify this, and > cache_hit_rate and others in "dump loads" seem relevant.
There are other indirect ways to measure cache effectiveness. Using the mds `perf dump` command, you can look at the objecter.omap_rd to see how often the MDS goes out to directory objects to read dentries. You can also look at the mds_mem.ino+ mds_mem.ino- to see how often inodes go in and out of the cache. -- Patrick Donnelly, Ph.D. He / Him / His Principal Software Engineer Red Hat, Inc. GPG: 19F28A586F808C2402351B93C3301A3E258DD79D _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
