Doesn't the mds log tell you which clients ids are with problems? Does you mds has enough RAM so that you can increase the default value 100000 of the mds cache size ?
Cheers G. ________________________________ From: Yutian Li [[email protected]] Sent: 11 November 2016 14:03 To: Goncalo Borges; [email protected] Subject: Re: [ceph-users] Locating CephFS clients in warn message As for now, when I run `dump_ops_in_flight`, `ops` in empty and `num_ops` is 0. But when I run `ceph status`, I still get 15 clients failing to respond to cache pressure. Where should I start solving this problem? On Thu, Nov 10, 2016 at 6:16 PM Goncalo Borges <[email protected]<mailto:[email protected]>> wrote: Hi "ceph daemon mds.<id> session ls", executed in your mds server, should give you hostname and client id of all your cephfs clients. "ceph daemon mds.<id> dump_ops_in_flight" should give you operations not completed or pending to complete for certain clients ids. In case of problems, that those problematic clients will probably appear there. Cheers Goncalo ________________________________________ From: ceph-users [[email protected]<mailto:[email protected]>] on behalf of Yutian Li [[email protected]<mailto:[email protected]>] Sent: 10 November 2016 15:21 To: [email protected]<mailto:[email protected]> Subject: [ceph-users] Locating CephFS clients in warn message I get a HEALTH_WARN when I run `ceph status`. It says health HEALTH_WARN mds0: Many clients (17) failing to respond to cache pressure I have 50 OSDs, 3 MONs, and 1 MDS. I just use CephFS and attach it to 20 ~ 30 clients using kernel mount option. I wonder how to locate those "many" clients that are failing to respond. I don't even see an ID of the lagging clients anywhere. Thanks!
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