Generation of a volume-level of an io request

A storage array comprising:

• a first controller comprising first instructions executable by the first controller;
• and
• a second controller comprising second instructions executable by the second controller;
• wherein the first controller is to receive an input/output (IO) request via a port of the first controller, when the first controller is not enabled to perform IO operations on a volume of the storage array and the second controller is enabled to perform IO operations on the volume of the storage array, the IO request specifying an IO operation targeting the volume of the storage array;
• wherein the first instructions are executable by the first controller to:
• generate a volume-level version of the IO request expressed in terms of a volume and at least one offset and useable by user space instructions of the second controller to perform the IO operation specified by the IO request;
• provide the volume-level version of the IO request to physical memory of the second controller by providing the volume-level version of the IO request to a designated region of physical memory of the first controller that is mapped to a designated region of the physical memory of the second controller;
• wherein the second instructions are executable by the second controller to:
• retrieve the volume-level version of the IO request from the designated region of the physical memory of the second controller;
• and
• perform the IO operation, which is specified by the volume-level version of the IO request, on the targeted volume of the storage array.

An article comprising at least one non-transitory machine-readable storage medium comprising instructions executable by a storage array comprising first and second controllers, wherein the instructions comprise:

• first instructions executable by the first controller to determine to forward an input/output (IO) request specifying an IO operation targeting a volume of the storage array, the IO request received by the first controller when the first controller is not enabled to perform IO operations on the targeted volume of the storage array and when the second controller is enabled to perform IO operations on the targeted volume of the storage array;
• wherein the first instructions are executable by the first controller to:
• generate a volume-level version of the IO request expressed in terms of a volume and at least one offset and useable by user space instructions of the second controller to perform the IO operation specified by the IO request;
• provide the volume-level version of the IO request to physical memory of the second controller by providing the volume-level version of the IO request to a designated region of physical memory of the first controller that is mapped to a designated region of the physical memory of the second controller;
• wherein the second instructions are executable by the second controller to:
• retrieve the volume-level version of the IO request from the designated region of the physical memory of the second controller;
• and
• perform the IO operation, which is specified by the volume-level version of the IO request, on the targeted volume of the storage array.