Comment 1 for bug 1469309

Not sure if the following scenarios should be mentioned in this bug or new bugs should be created (both similar but unique tracebacks included below in respective order):

1. A volume with that name already exists (perhaps on a different disk)
2. A volume group is assumed to exist when it does not

config-changed Physical volume "/dev/loop0" successfully created
config-changed A volume group called cinder-volumes already exists.
config-changed Traceback (most recent call last):
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/config-changed", line 519, in <module>
config-changed hooks.execute(sys.argv)
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/charmhelpers/core/hookenv.py", line 557, in execute
config-changed self._hooks[hook_name]()
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/charmhelpers/core/host.py", line 312, in wrapped_f
config-changed f(*args, **kwargs)
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/config-changed", line 131, in config_changed
config-changed conf['remove-missing'])
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/cinder_utils.py", line 372, in configure_lvm_storage
config-changed create_lvm_volume_group(volume_group, new_devices[0])
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/charmhelpers/contrib/storage/linux/lvm.py", line 105, in create_lvm_volume_group
config-changed check_call(['vgcreate', volume_group, block_device])
config-changed File "/usr/lib/python2.7/subprocess.py", line 511, in check_call
config-changed raise CalledProcessError(retcode, cmd)
config-changed subprocess.CalledProcessError: Command '['vgcreate', u'cinder-volumes', '/dev/loop0']' returned non-zero exit status 5

config-changed Volume group "cinder-volumes" not found
config-changed Traceback (most recent call last):
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/config-changed", line 519, in <module>
config-changed hooks.execute(sys.argv)
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/charmhelpers/core/hookenv.py", line 557, in execute
config-changed self._hooks[hook_name]()
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/charmhelpers/core/host.py", line 312, in wrapped_f
config-changed f(*args, **kwargs)
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/config-changed", line 131, in config_changed
config-changed conf['remove-missing'])
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/cinder_utils.py", line 377, in configure_lvm_storage
config-changed reduce_lvm_volume_group_missing(volume_group)
config-changed File "/var/lib/juju/agents/unit-cinder-0/charm/hooks/cinder_utils.py", line 313, in reduce_lvm_volume_group_missing
config-changed subprocess.check_call(['vgreduce', '--removemissing', volume_group])
config-changed File "/usr/lib/python2.7/subprocess.py", line 511, in check_call
config-changed raise CalledProcessError(retcode, cmd)
config-changed subprocess.CalledProcessError: Command '['vgreduce', '--removemissing', u'cinder-volumes']' returned non-zero exit status 5