I'm unable to reproduce this on s390x either; steps I took to reproduce:
Bootstrap local LXD provider using ZFS backend.
juju deploy -n 3 ceph-mon
juju deploy -n 3 ceph-osd && juju config ceph-osd osd-devices=/srv/osd
use-direct-io=False
juju deploy ceph-fs
juju add-relation ceph-mon ceph-osd
juju add-relation ceph-mon ceph-fs
I then mounted the cephfs created from the host system:
sudo mount -t ceph 10.189.59.86:6789:/ /mnt/cephfs -o
name=admin,secret=AQDW91xZWcFvIhAAbWVm3x6xx1LBDgvW7RyP9g==
after which I was able to write files to /mnt/cephfs:
ubuntu@s4lpb:/mnt/cephfs$ ls -lrt
total 314880
-rw-r--r-- 1 root root 322437120 Jul 3 21:54 zesty-server-cloudimg-arm64.img
-rw-r--r-- 1 root root 0 Jul 5 10:36 a
-rw-r--r-- 1 root root 0 Jul 5 10:36 b
ubuntu@s4lpb:/mnt/cephfs$ df -h
Filesystem Size Used Avail Use% Mounted on
[...]
10.189.59.86:6789:/ 43G 6.1G 37G 15% /mnt/cephfs
Confirming kernel version:
$ uname -a
Linux s4lpb 4.4.0-67-generic #88-Ubuntu SMP Wed Mar 8 16:39:07 UTC 2017 s390x
s390x s390x GNU/Linux
ubuntu@s4lpb:/mnt/cephfs$
** Changed in: ceph (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: ubuntu-z-systems
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1649872
Title:
Ceph cluster mds failed during cephfs usage
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