Time-Indexed Block Map for File Versioning
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Solution Overview
Problem
Conventional file system backup methods are inefficient, as they often result in the recovery of unnecessary data and fail to retain multiple versions of files effectively, leading to time-consuming restore operations and significant storage requirements.
Innovation Solution
A time-indexed block map mechanism is introduced in a file system that splits file extents upon writes, creating new entries with timestamps to manage multiple versions of file data, allowing for efficient retrieval and storage of file versions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional backup methods are used to periodically backup all data, then data protection is achieved, but storage space is significantly consumed and restore operations are time-consuming
Solution Approach 1:
The patent segments the backup process by implementing a block map that divides the file system into individual blocks, tracking only those blocks that have changed. This allows the system to backup only modified data segments rather than the entire file system, significantly reducing storage requirements while maintaining complete data protection capability.
Solution Approach 2:
The patent extracts and stores only the essential metadata needed for recovery - specifically the block map containing block identifiers and their locations. By extracting only this critical information rather than backing up entire files or directories, the system achieves comprehensive data protection with minimal storage overhead.
2Reliability
If conventional backup methods are used to periodically backup all data, then data protection is achieved, but restore operations become very time consuming
Solution Approach 1:
The patent performs preliminary actions by continuously maintaining an updated block map that tracks the location and state of every data block in real-time. This pre-computed metadata structure is prepared in advance, so when restoration is needed, the system can immediately retrieve only the necessary blocks without performing time-consuming full system scans or sequential restorations.
Solution Approach 2:
The patent extracts only the specific data blocks needed for restoration based on the block map metadata, rather than restoring entire files or the complete file system. This selective extraction dramatically reduces restore time by transferring and processing only the minimal necessary data.
3Reliability
If all versions of files are retained in a versioning file system, then data recovery capability is improved, but the amount of data to be maintained increases significantly
Solution Approach 1:
The patent merges multiple versions of the same data block into a single block map entry by tracking block identifiers. When files are updated, the system merges the new block data with existing blocks rather than creating separate duplicate storage structures for each version. This combining approach maintains full versioning capability while minimizing the actual data volume stored.
Solution Approach 2:
The patent changes the parameter representation from storing complete file copies to storing block-level identifiers and metadata. By transforming the data structure from file-based to block-based with timestamp/version information, the system achieves comprehensive versioning with dramatically reduced storage requirements.
4Ease of operation
If detailed catalogs and indices are maintained for large file systems, then data management capability is improved, but the size of metadata becomes very large
Solution Approach 1:
The patent segments the metadata structure into a hierarchical block map organized by data blocks rather than files or directories. This segmentation allows efficient indexing and search operations on individual blocks without requiring linear scans of large file-based catalogs, improving data management capability while keeping metadata compact.
Solution Approach 2:
The patent changes the metadata representation from file-based attributes to block-based identifiers with minimal associated data. By representing data locations as compact block identifiers rather than detailed file metadata, the system achieves superior data management efficiency with significantly reduced metadata size.
Data Source
AI summary
A method and mechanism for managing a time-indexed block map in a file system configured to store multiple versions of file data. A file system includes inodes or other structures corresponding to files in the system. Responsive to creating a file, one or more blocks are allocated for use in storing the file data. A block map is maintained for the file and is updated to include an identification of the blocks storing the file data and a timestamp corresponding to the stored data. In response to creating a file, data corresponding block map is maintained. In addition, a new entry is created in the block map which identifies the newly allocated blocks. Further, an entry of the block map is updated to (i) identify the particular blocks to which the write was directed and (ii) include a timestamp corresponding to the time of the write.