Handling path issues for storage copy services

A computer system for determining path health to conduct a plurality of Input-Output (IO) operations along a healthy path in a network, comprising:

• one or more processors, one or more computer-readable memories, one or more computer-readable tangible storage medium, and program instructions stored on at least one of the one or more tangible storage medium for execution by at least one of the one or more processors via at least one of the one or more memories, wherein the computer system is capable of performing a method comprising:
• receiving an original IO request from a user;
• sending the received original IO request on a first path from a primary site to a secondary site;
• determining a first IO response associated with the sent original IO request has exceeded a threshold time on the first path between the primary site and the secondary site;
• determining the first path has degraded between the primary site and the secondary site based on determining that the first IO response has exceeded the threshold time;
• generating a duplicate IO request based on the received original IO request;
• sending the generated duplicate IO request on a second path;
• receiving a second IO response associated with the sent duplicate IO request on the second path;
• receiving the first IO response associated with the original IO request on the first path;
• determining that the first IO response was received on the first path after the second IO response was received on the second path;
• determining a health state associated with the first path based on determining that the first IO response was received on the first path after the second IO response was received on the second path;
• and
• refreshing a path state machine based on the determined health state associated with the first path.

A computer program product for determining path health to conduct a plurality of Input-Output (IO) operations along a healthy path in a network, comprising:

• one or more computer-readable storage medium and program instructions stored on at least one of the one or more tangible storage medium, the program instructions executable by a processor, the program instructions comprising:
• program instructions to receive an original IO request from a user;
• program instructions to send the received original IO request on a first path from a primary site to a secondary site;
• program instructions to determine a first IO response associated with the sent original IO request has exceeded a threshold time on the first path between the primary site and the secondary site;
• program instructions to determine the first path has degraded between the primary site and the secondary site based on determining that the first IO response has exceeded the threshold time;
• program instructions to generate a duplicate IO request based on the received original IO request;
• program instructions to send the generated duplicate IO request on a second path;
• program instructions to receive a second IO response associated with the sent duplicate IO request on the second path;
• program instructions to receive the first IO response associated with the original IO request on the first path;
• program instructions to determine that the first IO response was received on the first path after the second IO response was received on the second path;
• program instructions to determine a health state associated with the first path based on determining that the first TO response was received on the first path after the second TO response was received on the second path;
• and
• program instructions to refresh a path state machine based on the determined health state associated with the first path.