Block write cache replication model

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

• determining that a primary host in a replica set is unavailable, the replica set comprising a primary ring buffer and one or more secondary ring buffers stored across a plurality of hosts;
• choosing a secondary host as a de-stage primary for the replica set;
• electing the secondary host as the de-stage primary for the replica set, including communicating an election to the secondary host, and wherein the secondary host is configured, based on receiving the election, to identify a ring buffer for the replica set and de-stage a plurality of logs from the ring buffer to a backing store;
• and
• receiving a notification from the secondary host, the notification indicating either a de-stage failure or a de-stage success.

A system, comprising:

• a first computer system comprising a first processor system and a first computer storage medium that stores first computer-executable instructions that are executable by the first processor system to at least:
• determine that a primary host in a replica set is unavailable, the replica set comprising a primary ring buffer and one or more secondary ring buffers stored across a plurality of hosts;
• choose a secondary host as a de-stage primary for the replica set;
• and
• elect the secondary host as the de-stage primary for the replica set, including communicating an election to the secondary host;
• and
• a second computer system comprising a second processor system and a second computer storage medium that stores second computer-executable instructions that are executable by the second processor system to at least:
• receive the election as the de-stage primary for the replica set from the first computer system;
• and
• based on receiving the election as the de-stage primary for the replica set,
• identify a ring buffer for the replica set that is stored in the second 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-stage the plurality of logs from the ring buffer to a backing store.