Asynchronous RAID Parity Calculation for SSD Controllers
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Solution Overview
Problem
Current RAID-enabled solid-state drive (SSD) controllers face inefficiencies in data read and write operations due to synchronous data activity, which can be time-consuming and stressful on the memory controller, especially when dealing with unrecoverable errors.
Innovation Solution
The implementation of a data storage device with a nonvolatile semiconductor storage array, a controller, and a buffer containing RAID units that concurrently processes write requests, calculates parity values, and reconstructs data using logical XOR operations, allowing for asynchronous data handling and reduced stress on the SSD controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous data activity is used to process read and write requests sequentially, then data integrity and RAID protection are maintained, but controller stress and operation time increase significantly
Solution Approach 1:
The patent transitions from synchronous to asynchronous data activity, allowing the controller to dynamically switch between processing modes. The controller can now handle parity calculations and data transfers independently without waiting for sequential completion, reducing controller stress while maintaining data integrity through proper synchronization mechanisms for critical operations.
Solution Approach 2:
The patent implements preliminary parity calculation during data write operations. By calculating parity values in advance and storing them alongside data, the system prepares recovery information before read operations are needed, eliminating the need for time-consuming sequential reads during error recovery and reducing overall operation time.
2Measurement precision
If all data is read from buffer to generate parity information, then accurate parity calculation is achieved, but operation time and controller load increase
Solution Approach 1:
The system calculates and stores parity information in advance during write operations. When data is written to the buffer, parity is simultaneously computed and stored, so that during read operations the parity is already available without requiring a full buffer read, significantly reducing operation time while maintaining accuracy.
Solution Approach 2:
The patent extracts the parity calculation function from the main data processing flow and performs it concurrently during write operations. This separates the parity generation task from the critical read path, allowing accurate parity to be prepared in advance without blocking time-sensitive operations.
3Stability of the object's composition
If synchronous parity calculation is performed after data accumulation, then data consistency is ensured, but write performance and throughput decrease
Solution Approach 1:
The patent implements continuous parallel operations where data transfer to buffer and parity calculation occur simultaneously rather than sequentially. Both operations proceed continuously and independently, with the controller initiating both actions at once, thereby maintaining data consistency while doubling the effective throughput compared to sequential processing.
Solution Approach 2:
The system dynamically manages multiple operation streams, allowing data transfer and parity calculation to proceed in parallel with independent timing. The controller dynamically coordinates these concurrent operations, ensuring data consistency through proper addressing and synchronization only where necessary, rather than enforcing rigid sequential execution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the efficiency of data read and write operations by reducing the computational load on the SSD controller and enabling faster recovery from unrecoverable errors, improving overall performance and data integrity.
Implementation Method 1
calculate parity values of the first data contained in the RAID units, each parity value relating to each write request
Data Source
AI summary
A data storage device comprises a storage array containing first data, a buffer containing RAID units, and a controller in communication with the storage array and the buffer. The controller is configured to receive a read request from a host device for a second data stored in the storage array, and determine an identifier associated with the requested second data. The controller is also configured to determine if the requested second data contains an unrecoverable error. The controller then accumulates first data, including a parity value, contained in the storage array associated with the same identifier as the requested second data in a reconstruction buffer, if the requested second data contains an unrecoverable error.