The lvol module has a different logic in check-mode for knowing when a change is induced. And this logic is *only* based on a size check. However during a normal run, it is the lvreduce or lvextend tool that decides when a change is performed (or when the requested and existing sizes differ). So while in check-mode the module reports a change, in real run-mode it does not in fact changes anything an reports ok.
One solution would be to implement the exact size-comparison logic that is implemented in lvextend and lvreduce, but we opted to use the `--test` option to each command to verify if a change is induced or not. In effect both check-mode and run-mode use the exact same logic and conclusion.
Occasionally, `lvcreate` will prompt on stdin for confirmation. In
particular, this may happen when the volume is being created close to
the location on disk where another volume existed previously. When this
happens, Ansible will hang indefinitely with no indication of the
problem. To work prevent this problem, the `--yes` command-line argument
can be passed to `lvcreate`, which will instruct it not to prompt.
Signed-off-by: Dustin C. Hatch <dustin@hatch.name>
