Intelligent Data Placement for Tape Backup Restoration
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Solution Overview
Problem
Current tape backup systems in disk storage environments lack efficient data placement strategies, leading to suboptimal data access and restoration processes, particularly in managing data relocation and sequence tracking across tape cartridges.
Innovation Solution
Implementing an intelligent data placement algorithm that relocates data based on access frequency and generates data placement records with sequence values, allowing for efficient writing and restoration of data across tape cartridges, using virtual disk locations and storage locations to maintain metadata and update record tables for accurate restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If data is backed up to tape storage using traditional methods, then backup storage is achieved at low energy cost, but data access and restoration efficiency deteriorates due to lack of intelligent data placement
Solution Approach 1:
The system performs preliminary actions by relocating data to optimal storage locations and recording placement information with sequence values before backup operations. Data placement records are created in advance, containing virtual disk locations, storage locations, and sequence values that enable efficient restoration without requiring full tape scans during recovery operations.
Solution Approach 2:
The patent introduces data placement records as an intermediary structure between the disk storage system and tape backup system. These records contain metadata about data locations and sequence values, acting as a mediator that enables efficient data retrieval without requiring direct inspection of tape contents during restoration.
2Adaptability or versatility
If data relocation is performed without sequence tracking, then storage flexibility improves, but restoration accuracy deteriorates due to inability to track data versions
Solution Approach 1:
The system implements feedback mechanisms by recording sequence values with each data placement operation. These sequence values provide feedback about the relative ordering of data placements, enabling the restoration process to accurately identify the most recent data version by comparing sequence values, thus maintaining restoration accuracy while allowing flexible data relocation.
Solution Approach 2:
The patent changes the parameter tracking approach by introducing sequence values that capture the temporal ordering of data placements. Instead of relying on fixed storage locations or timestamps, the system uses sequence values as a parameter that can be easily recorded and compared to determine data versioning, enabling both storage flexibility and restoration accuracy.
3Reliability
If complete data scanning is performed during restoration, then data recovery completeness improves, but restoration time increases significantly
Solution Approach 1:
The system performs preliminary actions by pre-recording data placement information with sequence values during backup operations. This preliminary documentation of data locations and sequences eliminates the need for complete tape scanning during restoration, as the restoration process can directly use the pre-recorded placement records to locate and recover data efficiently.
Solution Approach 2:
The patent creates copies of data location information in the form of data placement records that are stored separately from the actual backup data. These records contain virtual disk locations, storage locations, and sequence values that serve as a map for efficient data recovery, allowing restoration without scanning the entire tape content.
Data Source
AI summary
Data is relocated, based on an intelligent data placement algorithm, from a first storage location to a second storage location in a disk storage system. A data placement record is generated including a virtual disk location associated with the data, the second storage location, and a first sequence value. The first sequence value indicates relative sequence when compared to other sequence values. The data placement record is written to a first record location on a first tape cartridge loaded in a tape drive. The data placement records are used with data records to restore data to disk storage from tape backup.