RAID Data Access Lookup Table for Loss Detection
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Solution Overview
Problem
In RAID storage systems, data loss during the rebuilding process is not efficiently detected, leading to prolonged rebuilding times and reduced efficiency due to complex module interactions and low data accessing performance caused by frequent template comparisons.
Innovation Solution
A method where a data accessing device reads data from disks, checks if a lookup table indicating data loss is empty, and compares read data with table items only when the table is not empty, allowing the RAID module to independently record and manage data loss without involving other modules, thus simplifying operations and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequent template comparisons are performed to detect data loss, then data loss detection accuracy is improved, but data accessing performance deteriorates
Solution Approach 1:
The patent pre-generates a lookup table containing all possible data loss patterns before data accessing operations. This preliminary action allows the system to replace frequent template comparisons during data accessing with simple table lookups, thereby maintaining high detection accuracy while significantly improving accessing performance.
Solution Approach 2:
The patent creates a copy of data loss patterns in the form of a lookup table stored in memory. Instead of performing complex template comparisons during data accessing, the system uses this pre-computed copy to quickly determine whether data loss has occurred, reducing the computational burden during actual data operations.
2Loss of information
If complex module interactions are used to record data loss, then data loss recording completeness is improved, but system complexity increases
Solution Approach 1:
The patent extracts the data loss recording function from the complex multi-module interaction system and consolidates it into a single RAID module. The RAID module independently manages the lookup table and records data loss information without requiring coordination with other modules, thereby maintaining complete data loss recording while significantly simplifying the system architecture.
Solution Approach 2:
The RAID module is designed to independently perform data loss recording and management without requiring services or coordination from other modules. This self-service capability allows the RAID module to maintain complete data loss information while reducing system complexity by eliminating inter-module dependencies.
3Reliability
If constant template comparisons are performed during data accessing, then data loss detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent performs template comparisons in advance during system initialization or rebuilding phases to generate the lookup table. During normal data accessing operations, the system simply queries this pre-computed table, which requires minimal computational resources and power, thereby maintaining detection reliability while significantly reducing power consumption during data access.
Data Source
AI summary
Techniques for accessing data involve reading data from at least one disk among a plurality of disks. Such techniques further involve detecting whether a lookup table stored on a memory is empty, where the lookup table stores information indicating data loss. Such techniques further involve comparing, in response to the lookup table not being empty, data read information associated with the read data with table items in the lookup table to determine whether there is a table item in the lookup table that matches the data read information. Such techniques further involve sending, in response to determining that there is a table item that matches the data read information, the information indicating data loss. Such a technique improve the efficiency of data access, reduces the complexity of the system and the power consumption of the system, and improves the performance of the system.