Re: Write operation to cephFS mount hangs

[Gregory Farnum <gfarnum@xxxxxxxxxx>]

On Tue, Jul 31, 2018 at 7:46 PM Bödefeld Sabine <boedefeld@xxxxxxxxxxx> wrote:

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.

Sounds like the client has the MDS permissions required to update the CephFS metadata hierarchy, but lacks permission to write to the RADOS pools which actually store the file data. What permissions do the clients have? Have you checked with "ceph auth list" or similar to make sure they all have the same CephX capabilities?

-Greg

 

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

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com