Patent ID: 7013305

Claim:
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 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; 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.