Controlling the state of duplexing of coupling facility structures

A computer system for managing the state of duplexing of coupling facility structures, said computer system comprising:

• a memory;
• and
• a processor in communication with the memory, wherein the computer system is configured to perform a method, said method comprising:
• detecting that a connection between a first coupling facility having a first instance of a coupling facility structure and a second coupling facility having a second instance of the coupling facility structure has failed;
• determining whether another connection exists between the first coupling facility and the second coupling facility;
• preserving duplexing of the coupling facility structure, based on determining that another connection exists;
• and
• breaking duplexing of the coupling facility structure, based on determining that another connection does not exist.

A computer-implemented method of managing the state of duplexing of coupling facility structures, said computer-implemented method comprising:

• detecting that a connection between a first coupling facility having a first instance of a coupling facility structure and a second coupling facility having a second instance of the coupling facility structure has failed;
• determining whether another connection exists between the first coupling facility and the second coupling facility;
• preserving duplexing of the coupling facility structure, based on determining that another connection exists;
• and
• breaking duplexing of the coupling facility structure, based on determining that another connection does not exist.