The LEFTCLUSTER state may occur because a particular node panicked or hung. In this case, the procedure to clear LEFTCLUSTER is as follows:
Make sure the node is really down. If the node panicked and came back up, proceed to Step 2. If the node is in the debugger, exit the debugger. The node will reboot if it panicked, otherwise shut down the node, called the offending node in the following discussion.
While the offending node is down, use Cluster Admin to log on to one of the surviving nodes in the cluster. Invoke the CF GUI and select [Mark Node Down] from the [Tools] pull-down menu, then mark the offending node as DOWN.
This may also be done from the command line by using the following command:
#cftool -kBring the offending node back up. It will rejoin the cluster as part of the reboot process.