Immutable Snapshot Trigger Without Write Cache Flush
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Solution Overview
Problem
Existing storage systems face challenges in obtaining immutable snapshots for recovery after detecting corrupted data, as conventional methods require flushing the active write cache, which may include compromised data.
Innovation Solution
A method that triggers an immutable snapshot without forcing an active storage write cache to flush, allowing active write cache data to be analyzed to identify compromised writes, and subsequently taking a snapshot with the cache flushed to capture potentially compromised data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active storage write cache is flushed before taking an immutable snapshot, then data consistency is improved, but the snapshot may include compromised data that was written to the cache
Solution Approach 1:
The system performs preliminary analysis of the write cache contents before taking the snapshot, identifying and flagging potentially compromised data. This preliminary detection allows the snapshot to be taken with knowledge of which data blocks may be corrupted, enabling subsequent recovery operations to avoid these blocks while still capturing the overall system state.
Solution Approach 2:
The write cache is divided into individual data blocks that can be independently analyzed and flagged. Rather than treating the entire cache as a single unit, the system segments the cache into manageable blocks, analyzes each for signs of compromise, and creates a granularity-level map of clean versus compromised blocks. This segmentation enables selective inclusion of only clean blocks in the snapshot.
2Object-affected harmful factors
If the active storage write cache is not flushed before taking an immutable snapshot, then uncompromised data is preserved in the snapshot, but the snapshot may be inconsistent due to pending writes
Solution Approach 1:
The system introduces an intermediary analysis layer between the write cache and the snapshot creation process. This intermediary component examines the cache contents, identifies compromised blocks, and provides this information to the snapshot mechanism. The snapshot is then created with metadata indicating which blocks are clean, allowing the snapshot to represent an inconsistent state while still preserving uncompromised data for recovery purposes.
Solution Approach 2:
The system implements feedback mechanisms where the analysis of write cache contents informs the snapshot creation process. Detection software analyzes cache blocks for signs of compromise and feeds this information back to the snapshot mechanism, which then adjusts which blocks are included in the snapshot. This feedback loop enables the system to preserve uncompromised data while being transparent about the inconsistent state.
3Reliability
If the write cache is analyzed to identify compromised writes, then data integrity is improved, but additional processing time and complexity are required
Solution Approach 1:
The write cache analysis is performed using existing detection software and analysis mechanisms that are already part of the storage system. Rather than introducing completely new analysis tools, the system leverages existing malware detection, entropy analysis, and anomaly detection capabilities to identify compromised blocks. This self-service approach minimizes additional complexity while maintaining high data integrity.
Solution Approach 2:
The system changes the parameters of existing analysis tools to optimize them for cache block analysis. Rather than creating new complex algorithms, the system adjusts parameters of existing detection software to work efficiently with cache block structures, file system metadata, and write patterns. This parameter tuning approach improves data integrity while avoiding the complexity of entirely new analysis systems.
Data Source
AI summary
Obtaining immutable snapshots in storage systems for recovery after corrupted data detection. The method includes triggering an immutable snapshot without forcing an active storage write cache to flush so that active write cache data is not contained in the snapshot. The method includes analyzing current active writes in the write cache to identify compromised writes. Triggering the immutable snapshot may be in response to detection of a corrupted data risk and may be in addition to scheduled immutable snapshots or at the time of scheduled immutable snapshots.