Comment 11 for bug 1660240

2017-06-15 09:27:55 INFO config-changed Traceback (most recent call last):
2017-06-15 09:27:55 INFO config-changed File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/config-changed", line 524, in <module>
2017-06-15 09:27:55 INFO config-changed hooks.execute(sys.argv)
2017-06-15 09:27:55 INFO config-changed File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/charmhelpers/core/hookenv.py", line 731, in execute
2017-06-15 09:27:55 INFO config-changed self._hooks[hook_name]()
2017-06-15 09:27:55 INFO config-changed File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/charmhelpers/contrib/hardening/harden.py", line 79, in _harden_inner2
2017-06-15 09:27:55 INFO config-changed return f(*args, **kwargs)
2017-06-15 09:27:55 INFO config-changed File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/config-changed", line 335, in config_changed
2017-06-15 09:27:55 INFO config-changed prepare_disks_and_activate()
2017-06-15 09:27:55 INFO config-changed File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/config-changed", line 361, in prepare_disks_and_activate
2017-06-15 09:27:55 INFO config-changed ceph.tune_dev(dev)
2017-06-15 09:27:55 INFO config-changed File "lib/ceph/__init__.py", line 405, in tune_dev
2017-06-15 09:27:55 INFO config-changed persist_settings(settings_dict=save_settings_dict)
2017-06-15 09:27:55 INFO config-changed File "lib/ceph/__init__.py", line 224, in persist_settings
2017-06-15 09:27:55 INFO config-changed hdparm.write(render_template('hdparm.conf', settings_dict))
2017-06-15 09:27:55 INFO config-changed TypeError: expected a string or other character buffer object
2017-06-15 09:27:55 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1