Active

Virtual host is powered on. Usually this means that the OS is up and running.

Depending on the virtualization technology, an active virtual host can be deactivated, suspended, or migrated.

Defined

Virtual host is powered on. This means that the OS is definitely down.

Depending on the virtualization technology, a defined virtual host can be activated or migrated.

Suspended

Virtual host is powered off. Usually this means that an active virtual host was stopped and the RAM was written to persistent memory.

Depending on the virtualization technology, a suspended virtual host can be activated or migrated.

Unknown

The system could not retrieve a valid virtual host status from the virtualization manager. This can be caused by a problem with the virtual host or an internal error.