Cache optimization for a remote storage device

A computer program product comprising a computer readable storage medium, wherein the computer readable storage medium comprises computer program instructions that, when executed:

• based on one or more addresses associated with an input/output (I/O) data request, selects from a set of channels, a subset of one or more channels from a plurality of subsets of channels having a different associated cache hit probability level, to use to send the I/O data request through a network to a target device having an I/O cache;
• sends the I/O data request on a channel within the selected subset of one or more channels to access the I/O cache through the network;
• predicts an I/O cache hit probability level for the I/O data request, wherein predicting the I/O cache hit probability level for the I/O data request comprises using a depth level of the address in a request queue and comparing a predicted I/O cache hit probability level to a threshold,
• wherein the request queue comprises entries containing corresponding I/O data requests that at least one of:
• are to be sent or have already been processed, and
• wherein the entries are assigned hit probability levels based on depth levels of addresses, of the corresponding I/O data requests, in the request queue;
• selects the subset of the one or more channels to communicate the I/O data request to the target device based on the predicted I/O cache hit probability level being within a corresponding defined cache hit probability level for the selected subset of channels;
• and
• dynamically changes a number of channels currently assigned within the subset of the one or more channels based on at least one of a hit rate of addresses communicated by a subset of channels or a miss rate of addresses communicated by a subset of channels.

An apparatus comprising:

• a processing device;
• a network interface configured with a set of channels for communicating data with a target storage unit through a network;
• and
• memory operatively coupled to the processing device, wherein the memory stores computer program instructions that, when executed, cause the processing device to:
• based on one or more addresses associated with an input/output (I/O) data request, select from the set of channels, a subset of one or more channels from a plurality of subsets of channels having a different associated cache hit probability level, to use to send the I/O data request through a network to a target device having an I/O cache;
• send, via the network interface, the I/O data request on a channel within the selected subset of one or more channels to access the I/O cache through the network;
• predict an I/O cache hit probability level for the I/O data request, wherein predicting the I/O cache hit probability level for the I/O data request comprises using a depth level of the address in a request queue and comparing a predicted I/O cache hit probability level to a threshold,
• wherein the request queue comprises entries containing corresponding I/O data requests that at least one of:
• are to be sent or have already been processed, and
• wherein the entries are assigned hit probability levels based on depth levels of addresses, of the corresponding I/O data requests, in the request queue;
• select the subset of the one or more channels to communicate the I/O data request to the target device based on the predicted I/O cache hit probability level being within a corresponding defined cache hit probability level for the selected subset of channels;
• and
• dynamically change a number of channels currently assigned within the subset of the one or more channels based on at least one of a hit rate of addresses communicated by a subset of channels or a miss rate of addresses communicated by a subset of channels.