Cluster status reports MDSs behind on trimming
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HEALTH_WARN <x> MDSs behind on trimming
HEALTH_WARN x clients failing to respond to cache pressure
ceph config set mds mds_cache_trim_decay_rate 0.9 (1.0)
ceph config set mds mds_recall_max_caps 5500 (5000)
ceph config set mds mds_recall_max_decay_rate 2.25 (2.5)
If the "MDS behind on trimming" warnings are fixed by the customized settings and no adverse effects can be observed (concerns would be high CPU load of the MDS and a slowdown in metadata operations on the client side), consider setting the adjusted mds_cache_trim.* settings permanently.
Also see TID 000019591: When running "du" command on a cephfs mount, ceph -s reports 1 MDSs report oversized cache.
To get more details on the clients caps usage, the following commands can be useful:
ceph daemonperf mds.<ins_mds_server_name> (needs to be executed on the MDS host)
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- Document ID:000019740
- Creation Date: 15-Dec-2020
- Modified Date:15-Dec-2020
- SUSE Enterprise Storage
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