Hi Frank, This usually happens when the client is buggy/unresponsive. This warning is triggered when the client fails to respond to MDS's request to release caps in time which is determined by session_timeout(defaults to 60 secs). Did you make any config changes? *Dhairya Parmar* Associate Software Engineer, CephFS Red Hat Inc. <https://www.redhat.com/> dparmar@redhat.com <https://www.redhat.com/> On Tue, Aug 22, 2023 at 9:12 PM Frank Schilder <frans@dtu.dk> wrote:
Hi all,
I have this warning the whole day already (octopus latest cluster):
HEALTH_WARN 4 clients failing to respond to capability release; 1 pgs not deep-scrubbed in time [WRN] MDS_CLIENT_LATE_RELEASE: 4 clients failing to respond to capability release mds.ceph-24(mds.1): Client sn352.hpc.ait.dtu.dk:con-fs2-hpc failing to respond to capability release client_id: 145698301 mds.ceph-24(mds.1): Client sn463.hpc.ait.dtu.dk:con-fs2-hpc failing to respond to capability release client_id: 189511877 mds.ceph-24(mds.1): Client sn350.hpc.ait.dtu.dk:con-fs2-hpc failing to respond to capability release client_id: 189511887 mds.ceph-24(mds.1): Client sn403.hpc.ait.dtu.dk:con-fs2-hpc failing to respond to capability release client_id: 231250695
If I look at the session info from mds.1 for these clients I see this:
# ceph tell mds.1 session ls | jq -c '[.[] | {id: .id, h: .client_metadata.hostname, addr: .inst, fs: .client_metadata.root, caps: .num_caps, req: .request_load_avg}]|sort_by(.caps)|.[]' | grep -e 145698301 -e 189511877 -e 189511887 -e 231250695 {"id":189511887,"h":"sn350.hpc.ait.dtu.dk","addr":"client.189511887 v1: 192.168.57.221:0/4262844211","fs":"/hpc/groups","caps":2,"req":0} {"id":231250695,"h":"sn403.hpc.ait.dtu.dk","addr":"client.231250695 v1: 192.168.58.18:0/1334540218","fs":"/hpc/groups","caps":3,"req":0} {"id":189511877,"h":"sn463.hpc.ait.dtu.dk","addr":"client.189511877 v1: 192.168.58.78:0/3535879569","fs":"/hpc/groups","caps":4,"req":0} {"id":145698301,"h":"sn352.hpc.ait.dtu.dk","addr":"client.145698301 v1: 192.168.57.223:0/2146607320","fs":"/hpc/groups","caps":7,"req":0}
We have mds_min_caps_per_client=4096, so it looks like the limit is well satisfied. Also, the file system is pretty idle at the moment.
Why and what exactly is the MDS complaining about here?
Thanks and best regards. ================= Frank Schilder AIT Risø Campus Bygning 109, rum S14 _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io