Computing system including PLSO command to maintain equivalency between independent coupling facilities

A method of maintaining equivalency of independent structures located in different coupling facilities, the method comprising:

• generating, by an application executed by an operating system, a structure modification command to perform a data modification in a structure;
• performing a first data modification at a first structure included in a first coupling facility based on the structure modification command;
• outputting a first Push List Structure Object (PLSO) command data block after completing the first data modification, the PLSO command data block indicating the first data modification applied to the first structure;
• modifying a secondary structure included in a second coupling facility based on the first modification indicated by the PLSO command data block wherein the second coupling facility outputs a message response data block to the first coupling facility after receiving the PLSO command data block, the message response data block indicating a second data modification applied to the secondary structure;
• and
• outputting, from the second coupling facility, the message response data block in response to completing the second data modification at the secondary structure, the message response data block including secondary structure metadata indicating a processing status of data associated with the secondary structure.

A computer program product comprising a computer readable storage medium having program instructions for maintaining equivalency of independent structures located in different coupling facilities, the program instructions executable by a processor to perform operations of:

• performing a first data modification at a first structure included in a first coupling facility based on a structure modification command requested by an application executed by an operating system;
• outputting a first Push List Structure Object (PLSO) command data block after completing the first data modification, the PLSO command data block indicating the first data modification applied to the first structure;
• modifying a secondary structure included in a second coupling facility based on the first data modification indicated by the PLSO command data block, wherein the second coupling facility outputs a message response data block to the first coupling facility after receiving the PLSO command data block, the message response data block indicating a second data modification applied to the secondary structure;
• and
• outputting, from the second coupling facility, a message response data block in response to completing the second data modification at the secondary structure, the message response data block including secondary structure metadata indicating a processing status of data associated with the secondary structure.