Block write cache replication model

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

• receiving an election as a de-stage primary host for a replica set, the replica set comprising a primary ring buffer and one or more secondary ring buffers stored across a plurality of hosts;
• and
• based on receiving the election as the de-stage primary host for the replica set,
• identifying a ring buffer for the replica set that is stored in the computer system, the ring buffer comprising a plurality of logs replicated from the primary ring buffer at a different host of the plurality of hosts, each log corresponding to a different cached write input/output (I/O) request;
• and
• de-staging the plurality of logs from the ring buffer to a backing store.

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:
• receive a write input/output (I/O) operation from a consumer;
• select a first replica set for caching the write I/O operation from a replica list;
• add a first log corresponding to the write I/O operation to a primary ring buffer of the first replica set;
• determine that the first log cannot be replicated to a secondary ring buffer of the first replica set;
• select a second replica set for caching the write I/O operation from the replica list;
• add a second log corresponding to the write I/O operation to a primary ring buffer of the second replica set;
• determine that the second log has been replicated to a secondary ring buffer of the second replica set;
• and
• based on determining that the second log has been replicated to the secondary ring buffer of the second replica set,
• acknowledge the write I/O operation to the consumer;
• and
• de-stage the second log to a backing store.