OPTIMIZING SYNCHRONOUS I/O FOR zHYPERLINK

A computer program product for optimizing I/O performance between a host system and a storage system, the computer program product comprising a non-transitory computer-readable storage medium having computer-usable program code embodied therein, the computer-usable program code configured to perform the following when executed by at least one processor:

• manage different physicals paths for transmitting I/O requests between a host system and a storage system, the different physical paths comprising a higher performance communication path and a lower performance communication path;
• monitor conditions on the storage system, the conditions indicating availability of resources on the storage system;
• communicate information about the conditions from the storage system to the host system;
• determine whether the conditions satisfy certain thresholds;
• in response to determining that the conditions satisfy the thresholds, automatically increase a proportion of the I/O requests that are processed by the host system over the higher performance communication path and decrease a proportion of the I/O requests that are processed by the host system over the lower performance communication path;
• and
• in response to determining that the conditions do not satisfy the thresholds, automatically decrease the proportion of the I/O requests that are processed by the host system over the higher performance communication path and increase the proportion of the I/O requests that are processed by the host system over the lower performance communication path.

A system for optimizing I/O performance between a host system and a storage system, the system comprising:

• at least one processor;
• at least one memory device operably coupled to the at least one processor and storing instructions for execution on the at least one processor, the instructions causing the at least one processor to:
• manage different physicals paths for transmitting I/O requests between a host system and a storage system, the different physical paths comprising a higher performance communication path and a lower performance communication path;
• monitor conditions on the storage system, the conditions indicating availability of resources on the storage system;
• communicate information about the conditions from the storage system to the host system;
• determine whether the conditions satisfy certain thresholds;
• in response to determining that the conditions satisfy the thresholds, automatically increase a proportion of the I/O requests that are processed by the host system over the higher performance communication path and decrease a proportion of the I/O requests that are processed by the host system over the lower performance communication path;
• and
• in response to determining that the conditions do not satisfy the thresholds, automatically decrease the proportion of the I/O requests that are processed by the host system over the higher performance communication path and increase the proportion of the I/O requests that are processed by the host system over the lower performance communication path.