Managing the state of coupling facility structures, detecting by one or more systems coupled to the coupling facility, the suspended state of the duplexed command, detecting being independent of message exchange

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

• a data structure to provide state of one or more structures of a coupling facility, said data structure comprising a vector having an indicator for each structure of the one or more structures, said state relating to duplexing of said one or more structures, wherein the state of a structure of the one or more structures reflects whether the structure is duplexed in that a plurality of instances of the structure are concurrently updated to provide high availability of the structure;
• means for maintaining within the data structure state of the one or more structures, wherein the means for maintaining comprises means for setting the indicator for a structure to activate duplexing of the structure, and means for resetting the indicator to deactivate duplexing, wherein the resetting causes a duplexed command issued after duplexing is deactivated to be suspended;
• and
• means for detecting, by one or more systems coupled to the coupling facility, the suspended state of the duplexed command, said means for detecting lacking a message exchange.

At least one program storage device readable by a machine tangibly embodying at least one program of instructions executable by the machine to perform a method of managing the state of coupling facility structures, said method comprising:

• obtaining a data structure to provide state of one or more structures of a coupling facility, said data structure comprising a vector having an indicator for each structure of the one or more structures, said state relating to duplexing of said one or more structures, wherein the state of a structure of one or more structures reflects whether the structure is duplexed in that a plurality of instances of the structure are concurrently updated to provide high availability of the structure;
• maintaining within the data structure state of the one or more structures, wherein the maintaining comprises setting the indicator for a structure to activate duplexing of the structure, and resetting the indicator to deactivate duplexing, wherein the resetting causes a duplexed command issued after duplexing is deactivated to be suspended;
• and
• detecting, by one or more systems coupled to the coupling facility, the suspended state of the duplexed command, said detecting being independent of a message exchange.

A method of managing the state of coupling facility structures, said method comprising:

• obtaining a data structure to provide state of one or more structures of a coupling facility, said state relating to duplexing of said one or more structures;
• maintaining within the data structure state of the one or more structures, said maintaining changing the state of a structure of the one or more structures from one state to another state;
• and
• detecting, by one or more systems coupled to the coupling facility, a changed state of a duplexed command effected by the changing of the state of the structure to the another state, said detecting being independent of a message exchange.