Thank you for your answer and time.
When I press Control-C right after the BIOS message, I can’t get to LOADER A> prompt but can get and login to LOADER B> prompt. At that point, I performed "cf takeover" and there is a messsage;
“cf: takeover cannot be performed because of reason (partner halted in notakeover mode)”
Is this mentioned partner which is halted in notakeover mode, LOADER A, or is it itself LOADER B? If it is LOADER B, at that point is it possible to get it to “takeover mode”?
What about Force takeover command? It is said to be dangerous to perform it on the manual;
forcetakeover [-f] forcetakeover is dangerous and can lead to data corruption; in almost all cases, use
cf takeover instead.
Forces one node to take over its partner, even though the node detects an error that would otherwise
prevent a takeover. For example, normally, if a detached or faulty Infiniband cable between the nodes
causes the nodes’ NVRAM contents to be unsynchronized, takeover is disabled. However, if you enter the cf forcetakeover command, the node takes over its partner despite the unsynchronized NVRAM contents. This command might cause the node being taken over to lose client data. If you use the -f option, the cf command allows such a forcetakeover to proceed without requiring confirmation by the operator.