Dynamic resource allocation for distributed cluster-storage network

An apparatus operable in a distributed cluster storage network having a host computer system and a storage subsystem having a plurality of storage control nodes each operable to write data to storage responsive to a request from said host computer system, comprising:

• a forwarding layer at a first of said plurality of storage control nodes operable to forward data to a second of said plurality of storage control nodes;
• a buffer control component at each of said plurality of storage control nodes operable to allocate buffer resource for data to be written to said storage;
• and
• a communication link between said buffer control component and said forwarding layer at each of said plurality of storage control nodes operable to communicate a constrained and unconstrained status indicator of said buffer resource to said forwarding layer, the status indicator communicating an indication of when a particular set of input/output (I/O) operations are being processed expeditiously and when the particular set of I/O operations are under delay.

A computer program product for operating a distributed cluster storage network in a computing environment by a processor device, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:

• an executable portion that receives at a first of said plurality of storage control nodes a request to write data to storage from said host computer system;
• an executable portion that forwards said data by a forwarding layer at said first of a plurality of storage control nodes to a second of said plurality of storage control nodes;
• an executable portion that allocates buffer resource for data to be written to said storage by a buffer control component at each of said plurality of storage control nodes;
• and
• an executable portion that communicates a constrained and unconstrained status indicator of said buffer resource to said forwarding layer, the status indicator communicating an indication of when a particular set of input/output (I/O) operations are being processed expeditiously and when the particular set of I/O operations are under delay.