Op Log Resynchronization Across Storage Clusters After Sync Failures

The patent applies preliminary action by pre-establishing and maintaining Op logs on both primary and secondary storage clusters before failures occur. These logs continuously track inflight operations and their states, enabling rapid resynchronization without requiring full re-replication after disruptions. The Op logs are updated in advance during normal operation, so when a failure occurs, the system already has the necessary operational history to quickly recover consistency.

The patent applies universality by designing Op logs that serve multiple critical functions: tracking inflight operations during normal operation, enabling failure detection, facilitating resynchronization after disruptions, and maintaining replication consistency. Rather than implementing separate mechanisms for each function, the Op log structure is designed to handle all these purposes with a single unified system, reducing overall complexity despite the advanced capabilities provided.

The patent applies continuity of useful action by using Op logs to track and manage I/O operations during failure conditions. Instead of completely blocking operations, the system continues to log and monitor inflight operations, enabling them to be processed and synchronized after the failure is resolved. The Op logs maintain the state of operations that were interrupted, allowing the system to resume service with minimal disruption and maintain data consistency without complete unavailability.