Input/output processing in a distributed storage node with rdma

A distributed storage node, comprising:

• a memory that stores instructions;
• and
• one or more processors in communication with the memory, wherein the one or more processors execute the instructions to:
• receive a request for an input/output (I/O) process associated with data;
• in response to the request, allocate using an operating system driver of the distributed storage node, a memory segment shared between the operating system and a user process running on the distributed storage node, wherein:
• the user process includes an I/O stack for processing the request;
• the shared memory segment includes a context memory portion storing context information associated with the I/O stack, a header memory portion storing header information for the I/O process, and a data memory portion for storing the data;
• and
• the shared memory segment is registered for RDMA access with a target storage node;
• perform an RDMA transfer between the shared memory segment of the distributed storage node and the target storage node to complete the I/O process;
• and
• deallocate the shared memory segment in response to receiving a status indicator of completion of the RDMA transfer.

A non-transitory computer-readable medium storing computer instructions for remote direct memory access (RDMA) by a distributed storage node, wherein the instructions when executed by one or more processors, cause the one or more processors to perform steps of:

• receiving a request for an input/output (I/O) process associated with data;
• in response to the request, allocating using an operating system driver of the distributed storage node, a memory segment shared between the operating system and a user process running on the distributed storage node, wherein:
• the user process includes an I/O stack for processing the request;
• the shared memory segment includes a context memory portion storing context information associated with the I/O stack, a header memory portion storing header information for the I/O process, and a data memory portion for storing the data;
• and
• the shared memory segment is registered for RDMA access with a target storage node;
• performing an RDMA transfer between the shared memory segment of the distributed storage node and the target storage node to complete the I/O process;
• and
• deallocating the shared memory segment in response to receiving a status indicator of completion of the RDMA transfer.