Queue management in multi-site storage systems

A system comprising:

• a processor;
• and
• a computer-readable storage medium communicatively coupled to the processor and storing program instructions which, when executed by the processor, are configured to cause the processor to:
• receive, from a host, by a backup storage system, a request to process a first set of Input/Output (I/O) queues on the backup storage system, wherein the backup storage system is a second subsystem in a multi-site storage system;
• allocate memory on the backup storage system for processing the first set of I/O queues;
• identify a second set of I/O queues established at a primary storage system, wherein the primary storage system is a first subsystem in the multi-site storage system and the backup storage system includes a backup copy of data stored on the primary storage system;
• determine the first set of I/O queues are redundant, wherein the first set of I/O queues are redundant when the first set of I/O queues and the second set of I/O queues process an equivalent set of commands, as included in the request;
• responsive to determining that the first set of I/O queues are redundant:
• notify via the host, that the first set of I/O queues are redundant;
• terminate a connection between the host and the backup storage system;
• and
• de-allocate the memory to process the first set of I/O queues.

A computer program product, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processing unit to cause the processing unit to:

• receive, from a host, by a backup storage system, a request to process a first set of Input/Output (I/O) queues on the backup storage system, wherein the backup storage system is a second subsystem in a multi-site storage system;
• allocate memory on the backup storage system for processing the first set of I/O queues;
• identify a second set of I/O queues established at a primary storage system, wherein the primary storage system is a first subsystem in the multi-site storage system and the backup storage system includes a backup copy of data stored on the primary storage system;
• determine the first set of I/O queues are redundant, wherein the first set of I/O queues are redundant when the first set of I/O queues and the second set of I/O queues process an equivalent set of commands, as included in the request;
• responsive to determining that the first set of I/O queues are redundant:
• notify via the host, that the first set of I/O queues are redundant;
• terminate a connection between the host and the backup storage system;
• and
• de-allocate the memory to process the first set of I/O queues.