Write operation to cephFS mount hangs

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Hello,

 

we have a Ceph Cluster 10.2.10 on VMs with Ubuntu 16.04 using Xen as the hypervisor. We use CephFS and the clients use ceph-fuse to access the files.

Some of the ceph-fuse clients hang on write operations to the cephFS. On copying a file to the cephFS, the file is created but it's empty and the write operation hangs forever. Ceph-fuse version is 10.2.9.

In the logfile of the mds there are no error messages. Also, ceph health returns HEALTH_OK.

ceph daemon mds.eco61 session ls reports no problems (if I interpret correctly):

   {

        "id": 64396,

        "num_leases": 2,

        "num_caps": 32,

        "state": "open",

        "replay_requests": 0,

        "completed_requests": 1,

        "reconnecting": false,

        "inst": "client.64396 192.168.1.179:0\/980852091",

        "client_metadata": {

            "ceph_sha1": "2ee413f77150c0f375ff6f10edd6c8f9c7d060d0",

            "ceph_version": "ceph version 10.2.9 (2ee413f77150c0f375ff6f10edd6c8f9c7d060d0)",

            "entity_id": "admin",

            "hostname": "eco79",

            "mount_point": "\/mnt\/cephfs",

            "root": "\/"

        }

    },

 

Does anyone have an idea where the problem lies? Any help would be greatly appreciated.

Thanks very much,

Kind regards

Sabine

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