Remote direct memory access data replication model

A method implemented in a computer system that includes a processor system, comprising:

• receiving a Remote Direct Memory Access (RDMA) write operation from a remote computer system, the RDMA write operation comprising a data portion of a log;
• storing the data portion of the log in a memory without use of the processor system;
• receiving a first RDMA send operation from the remote computer system, wherein the first RDMA send operation is issued by the remote computer system after the RDMA write operation, and the first RDMA send operation comprises a metadata portion of the log;
• storing the metadata portion of the log in the memory with use of the processor system, wherein RDMA protocol ordering guarantees associated with the first RDMA send operation ensure completion of the RDMA write operation upon processing of the first RDMA send operation at the computer system;
• and
• sending a second RDMA send operation to the remote computer system after storing the metadata portion of the log in the memory, wherein completion of replication of the log is determined by the remote computer system using the RDMA protocol ordering guarantees associated with the first RDMA send operation.

A computer system, comprising:

• a processor system;
• and
• a computer storage medium that stores computer-executable instructions that are executable by the processor system to at least:
• identify a log for replication to a remote computer system, the log comprising a data portion and a metadata portion;
• send the data portion to the remote computer system using a Remote Direct Memory Access (RDMA) write operation;
• send the metadata portion to the remote computer system using a first RDMA send operation, wherein:
• the first RDMA send operation is issued after sending the data portion to the remote computer system using the RDMA write operation, and
• RDMA protocol ordering guarantees associated with the RDMA send operation ensure completion of the RDMA write operation upon processing of the first RDMA send operation at the remote computer system;
• identify a second RDMA send operation received from the remote computer system, the second RDMA send operation signaling completion of the first RDMA send operation;
• and
• de-stage the log to a backing store based on identifying the second RDMA send operation, wherein the de-staging is performed based on determining that replication of the log to the remote computer system has completed, the determining being based on the RDMA protocol ordering guarantees associated with the first RDMA send operation and on identifying the second RDMA send operation.