Cache allocation for controller boards based on prior input-output operations

A method comprising:

• obtaining a given input-output operation from a host device;
• identifying a target controller board of a plurality of controller boards of a storage array and a target portion of the storage array based at least in part on the obtained given input-output operation;
• determining, based at least in part on metadata stored in a metadata structure of the storage array, a likelihood that a given controller board of the plurality of controller boards will receive a future input-output operation, the metadata being associated with a plurality of prior input-output operations, each of the prior input-output operations being directed to a corresponding portion of the storage array, the metadata associated with each prior input-output operation comprising an indication of which of the plurality of controller boards was utilized to service that prior input-output operation and an input-output size for that prior input-output operation;
• determining, based at least in part on the likelihood, that the given controller board has a higher likelihood of receiving a future input-output operation than at least one other controller board of the plurality of controller boards;
• allocating a portion of the cache to the given controller board as a buffer for storing target data associated with the given input-output operation;
• and
• servicing the given input-output operation by the target controller board, the target controller board utilizing the buffer to service the input-output operation;
• wherein the method is performed by at least one processing device of the storage array.

A computer program product comprising a non-transitory processor-readable storage medium having stored therein program code of one or more software programs, wherein the program code, when executed by at least one processing device of a storage array, the storage array comprising a plurality of controller boards and a cache, the cache comprising a metadata structure, the metadata structure storing metadata associated with a plurality of prior input-output operations, each of the prior input-output operations being directed to a corresponding portion of the storage array, the metadata associated with each prior input-output operation comprising an indication of which of the plurality of controller boards was utilized to service that prior input-output operation and an input-output size for that prior input-output operation, causes the at least one processing device:

• to obtain a given input-output operation from a host device;
• to identify a target controller board of the plurality of controller boards and a target portion of the storage array based at least in part on the obtained given input-output operation;
• to determine, based at least in part on the metadata stored in the metadata structure, a likelihood that a given controller board of the plurality of controller boards will receive a future input-output operation;
• to determine, based at least in part on the likelihood, that the given controller board has a higher likelihood of receiving a future input-output operation than at least one other controller board of the plurality of controller boards;
• to allocate a portion of the cache to the given controller board as the buffer for storing target data associated with the given input-output operation;
• and
• to service the given input-output operation by the target controller board, the target controller board utilizing the buffer allocated to the given controller board to service the input-output operation.