online 

Indicates that the Logical Volume is active. 

Indicates that the specified volume is started and that I/O is permitted. 

offline 

Indicates that the Logical Volume is not active. 

Indicates that the specified volume is not started—and I/O is not permitted. 

unknown 

Indicates that a problem exists either with the configuration or the ability to determine the status of the resource. 

Indicates that the agent could not determine the state of the resource or that the resource attributes are invalid.