Host device IO selection using buffer availability information obtained from storage system

An apparatus comprising:

• at least one processing device comprising a processor coupled to a memory;
• wherein the at least one processing device is configured:
• to obtain, in a host device coupled to a storage system over one or more networks, buffer availability information from the storage system, the buffer availability information indicating that the storage system is currently experiencing a deficiency in a number of available buffers of at least one buffer size of a plurality of different buffer sizes supported by the storage system;
• and
• to select in the host device particular input-output operations for delivery to the storage system over the one or more networks based at least in part on the obtained buffer availability information;
• wherein selecting particular input-output operations for delivery to the storage system over one or more networks based at least in part on the obtained buffer availability information comprises, responsive to the buffer availability information indicating that there is a deficiency in a number of available buffers of at least one of one or more relatively smaller sizes within the storage system, at least temporarily prioritizing selection of input-output operations having data sizes that are matched to at least one of one or more relatively larger sizes, the one or more relatively larger sizes being measured relative to the one or more relatively smaller sizes and vice-versa.

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 comprising a processor coupled to a memory, causes the at least one processing device:

• to obtain, in a host device coupled to a storage system over one or more networks, buffer availability information from the storage system, the buffer availability information indicating that the storage system is currently experiencing a deficiency in a number of available buffers of a given one of at least first and second different buffer sizes supported by the storage system;
• and
• to select in the host device particular input-output operations for delivery to the storage system over the one or more networks based at least in part on the obtained buffer availability information;
• wherein selecting particular input-output operations for delivery to the storage system over one or more networks based at least in part on the obtained buffer availability information comprises, responsive to the buffer availability information indicating that there is a deficiency in a number of available buffers of a relatively smaller size within the storage system, temporarily prioritizing selection of input-output operations having data sizes that are matched to a relatively larger size.

A method comprising:

• obtaining, in a host device coupled to a storage system over one or more networks, buffer availability information from the storage system, the buffer availability information indicating that the storage system is currently experiencing a deficiency in a number of available buffers of a given one of at least first and second different buffer sizes supported by the storage system;
• and
• selecting in the host device particular input-output operations for delivery to the storage system over the one or more networks based at least in part on the obtained buffer availability information;
• wherein selecting particular input-output operations for delivery to the storage system over one or more networks based at least in part on the obtained buffer availability information comprises, responsive to the buffer availability information indicating that there is a deficiency in a number of available buffers of a relatively smaller size within the storage system. temporarily prioritizing selection of input-output operations having data sizes that are matched to a relatively larger size;
• and
• wherein the method is performed by at least one processing device comprising a processor coupled to a memory.