If a node is shut down normally, it is considered DOWN by the remaining nodes. If it leaves the cluster unexpectedly, it will be considered LEFTCLUSTER. It is important to mark a node DOWN as SOON as possible to allow normal cluster operation for the remaining nodes. The menu option Tools->Mark Node Down allows nodes to be marked as DOWN.
Note
Marking a node DOWN should be only done if the node is actually down (inoperable or inoperative); otherwise, this could cause data corruption.
To do this, select Tools->Mark Node Down. This displays a dialog of all of the nodes that consider another node to be LEFTCLUSTER. Clicking on one of them displays a list of all the nodes that node considered LEFTCLUSTER. Select one and then click OK. This clears the LEFTCLUSTER status on that node.
Refer to the Chapter "Chapter 5 LEFTCLUSTER state" for more information on the LEFTCLUSTER state.
