Hi Gregory Yes they have the same key and permissions. ceph auth list on the mds server gives client.admin key: <key> caps: [mds] allow * caps: [mon] allow * caps: [osd] allow * On the client /etc/ceph/ceph.client.admin.keyring [client.admin] key = <key> caps mds = "allow *" caps mon = "allow *" caps osd = "allow *" I checked that the key is identical, also that the keyring is the same on both the clients that work and on the clients where the write operations fail. Do you have any other suggestions?
Kind regards Sabine
Dr. sc. techn. ETH
Sabine Bödefeld
Senior Consultant
ECOSPEED AG
Drahtzugstrasse 18
CH-8008 Zürich
Tel. +41 44 388 95 04
Fax: +41 44 388 95 09
Web: http://www.ecospeed.ch
 Von: Gregory Farnum [mailto:gfarnum@xxxxxxxxxx]
Gesendet: Mittwoch, 1. August 2018 06:10
An: Bödefeld Sabine
Cc: ceph-users@xxxxxxxxxxxxxx
Betreff: Re: Write operation to cephFS mount hangs 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? 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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