Load balancing based on utilization percentage of CPU cores

A computer program product for storage level load balancing, the computer program product comprising one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions including instructions to:

• monitor a load level of a storage system, wherein the load level is a utilization percentage of a plurality of CPU cores in the storage system;
• detect an overload condition based on the utilization percentage of one or more CPU cores of the plurality of CPU cores exceeds a first threshold, wherein the overload condition is caused by an overlap of one or more I/O queues from each host computer of a plurality of host computers accessing a first CPU core of the plurality of CPU cores in the storage system;
• responsive to detecting the overload condition, select a new I/O queue on a second CPU core of the plurality of CPU cores in the storage system, wherein the second CPU core has the utilization percentage less than a second threshold;
• and
• send a recommendation to a first host computer of the plurality of host computers, wherein the recommendation is to move an I/O traffic from the first CPU core to the new I/O queue on the second CPU core to rebalance the load level of the storage system.

A computer system for storage level load balancing, the computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• and
• program instructions stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, the stored program instructions including instructions to:
• monitor a load level of a storage system, wherein the load level is a utilization percentage of a plurality of CPU cores in the storage system;
• detect an overload condition based on the utilization percentage of one or more CPU cores of the plurality of CPU cores exceeds a first threshold, wherein the overload condition is caused by an overlap of one or more I/O queues from each host computer of a plurality of host computers accessing a first CPU core of the plurality of CPU cores in the storage system;
• responsive to detecting the overload condition, select a new I/O queue on a second CPU core of the plurality of CPU cores in the storage system, wherein the second CPU core has the utilization percentage less than a second threshold;
• and
• send a recommendation to a first host computer of the plurality of host computers, wherein the recommendation is to move an I/O traffic from the first CPU core to the new I/O queue on the second CPU core to rebalance the load level of the storage system.

A computer-implemented method for storage level load balancing, the computer-implemented method comprising the steps of:

• responsive to receiving a command from a host computer to establish an I/O queue pair, allocating, by one or more computer processors, a processor resources and a memory resources in a storage system, wherein the storage system implements a Non-Volatile Memory Express over Fabrics (NVMe-oF) architecture;
• detecting, by the one or more computer processors, an overload condition on a first CPU core of a plurality of CPU cores in the storage system, wherein the overload condition is an overlap of a plurality of host computers using a same I/O queue pair;
• and
• responsive to detecting the overload condition, sending, by the one or more computer processors, a recommendation to a first host computer of the plurality of host computers, wherein the recommendation is to move an I/O traffic from the first CPU core to a new I/O queue on a second CPU core of the plurality of CPU cores in the storage system to rebalance a load level of the storage system, wherein the second CPU core of the plurality of CPU cores in the storage system has a utilization percentage less than a second threshold.

A computer system for storage level load balancing, the computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• and
• program instructions stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, the stored program instructions including instructions to:
• responsive to receiving a command from a host computer to establish an I/O queue pair, allocate a processor resources and a memory resources in a storage system, wherein the storage system implements a Non-Volatile Memory Express over Fabrics (NVMe-oF) architecture;
• detect an overload condition on a first CPU core of a plurality of CPU cores in the storage system, wherein the overload condition is an overlap of a plurality of host computers using a same I/O queue pair;
• and
• responsive to detecting the overload condition, send a recommendation to a first host computer of the plurality of host computers, wherein the recommendation is to move an I/O traffic from the first CPU core to a new I/O queue on a second CPU core of the plurality of CPU cores in the storage system to rebalance a load level of the storage system, wherein the second CPU core of the plurality of CPU cores in the storage system has a utilization percentage less than a second threshold.