Have you already tried to adjust the
"mds_cache_memory_limit" and or
"ceph tell mds.* cache drop"? I really wonder how the MDS copes with
that with milions of CAPS.
I played with the cache size, yeah. I kind of need a large cache,
otherwise everything is just slow and I'm constantly getting cache size
ceph tell mds.* doesn't work when the FS is degraded.