Asynchronous Replication Snapshot Recovery for Data Consistency
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Solution Overview
Problem
Asynchronous data replication interruptions can lead to inconsistent states between primary and secondary storage objects, making it difficult to recover data to a precise point in time due to unordered updates during resumed replication.
Innovation Solution
Automatically generating snapshots of replica storage objects upon detection of asynchronous replication interruption, accumulating updates during the interruption, and resuming asynchronous replication when the interruption ends, ensuring consistent data recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If asynchronous replication is resumed after interruption, then data transfer continues, but updates are applied in unpredictable order causing inconsistency
Solution Approach 1:
The system performs preliminary actions by detecting replication interruptions and automatically generating snapshots of the replica storage object before resuming replication. This preliminary snapshot creation ensures that a consistent recovery point is established prior to applying subsequent updates, preventing the inconsistency problem that would otherwise occur when updates are applied in unpredictable orders after resumption.
2Measurement precision
If snapshots are created frequently to ensure consistency, then data recovery precision improves, but storage and memory resources are consumed
Solution Approach 1:
Instead of creating snapshots frequently and uniformly, the system applies local quality by creating snapshots selectively only when replication interruptions is detected. This targeted approach ensures that snapshots are generated precisely where needed (at interruption points) rather than continuously, thereby maintaining recovery precision while minimizing unnecessary consumption of storage and memory resources.
3Loss of substance
If replication updates are accumulated during interruption, then data loss is minimized, but the complexity of managing unordered updates increases
Solution Approach 1:
The system introduces an intermediary mechanism by automatically detecting replication interruptions and generating snapshots that serve as intermediary recovery points. These snapshots act as mediators that organize and structure the accumulated updates, allowing the system to minimize data loss while reducing the complexity of managing unordered updates through automated snapshot-based recovery point establishment.
Data Source
AI summary
A disaster recovery storage array automatically generates snapshots of replica storage objects responsive to detection of interruption of asynchronous replication of production storage objects of a primary storage system to the replica storage objects. The primary storage array accumulates updates to the production storage objects over a plurality of asynchronous replication cycles during the interruption. Asynchronous replication automatically resumes when the interruption ends. Accumulation of updates and resumption of asynchronous replication may be performed iteratively if there are multiple interruptions before the replica storage objects are consistent with the production storage objects. The snapshots are automatically discarded after the replica storage objects are made consistent with the production storage objects.