FSCK Utility for Deduplicated File System Recovery
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Solution Overview
Problem
Deduplication systems face challenges in recovering data due to inconsistencies caused by deduplicated data blocks, which can lead to data loss and inability to recover entire file systems, as conventional FSCK utilities struggle to handle deduplicated data blocks accessed by multiple logical offsets.
Innovation Solution
The method involves evaluating metadata to determine deduplication status and selectively recovering data blocks based on this status, updating deduplication status, and using an index table to manage deduplicated data blocks, allowing the FSCK utility to recover deduplicated file systems by focusing on non-deduplicated blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If deduplication is implemented to reduce storage costs, then storage efficiency is improved, but data recovery capability deteriorates
Solution Approach 1:
The patent segments the file system into multiple components: active file system data, deduplicated data blocks, and metadata. By separating these components and managing them independently, the system can efficiently store deduplicated data while maintaining the ability to recover file system inconsistencies through targeted metadata validation and reconstruction processes.
Solution Approach 2:
The patent introduces an intermediary metadata structure that tracks the relationship between logical file system objects and their physical deduplicated data block locations. This metadata acts as a mediator that enables recovery operations to reconstruct file system state without requiring duplicate copies of the actual data blocks.
2Reliability
If conventional FSCK utility is used to verify file system integrity, then file system consistency is improved, but it cannot handle deduplicated data blocks accessed by multiple logical offsets
Solution Approach 1:
The patent changes the parameters of the FSCK utility by extending it to recognize and process deduplication status information. The utility now accepts additional parameters including deduplication identifiers and multiple logical offset mappings, allowing it to verify consistency across deduplicated blocks without treating them as errors.
Solution Approach 2:
The patent makes the FSCK utility universal by enabling it to handle both traditional non-deduplicated file systems and deduplicated file systems. The utility automatically detects the file system type and adjusts its verification procedures accordingly, maintaining compatibility with conventional systems while adding capability to process deduplicated data blocks with multiple logical offsets.
Data Source
AI summary
A method is used in recovering in deduplication systems. Metadata of a data object is evaluated for determining deduplication status for the data object. Based on the deduplication status, the data object is recovered.