This object identifies the state of the mirror.
The value of 'sync' means synchronize mannually.
The value of 'swap' means switch the roles of the primary resource and
mirror resource.
The value of 'promte' means break the mirrored pair and convert the mirror
resource into an independent logic volume. The new logic volume will have
all of the properties of a regular logic volume.
Note that if the action of 'promte' is executed successfully, this mirror
resource will become a primary logic volume, and this entry will be deleted
automatically.