The state of the node is different from up:
booting - Node is booting up.
down - Node has stopped or is dumping core.
taken_over - Node has been taken over by its HA partner and is not yet waiting for giveback.
waiting_for_giveback - Node has been taken over by its HA partner and is waiting for the HA partner to giveback disks.
degraded - Node has one or more critical services offline.
unknown - Node or its HA partner cannot be contacted and there is no information on the node's state.