Whether the structure can be copied or duplexed to another location. Duplexing options are ignored if the structure is not a cache structure, the users of the structure do not support user-managed duplexing, and the duplexing option is not defined in the CFRM couple data sets.
Specify DISABLED if the structure does not support duplexing or you do not want to enable the duplexing function.
Specify ENABLED if the structure supports duplexing through MVS. MVS will initiate and attempt to maintain a user-managed duplexing operation for the structure. When the duplexing is stopped, MVS attempts to initiate duplexing again.
Specify ALLOWED if the application can initiate its own duplexing of the structure or an operator can start duplexing the structure through SETXCF START,DUPLEX.