Out of Order LBA Processing for Storage Devices
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Solution Overview
Problem
Conventional data storage devices face inefficiencies in reading sequential logical block address (LBA) ranges due to the need to read data in sequential order, which can lead to halted operations for error recovery, resulting in increased time and reduced input/output operations per second (IOPS).
Innovation Solution
Implementing a non-sequential LBA processing module that allows data storage devices to read sequential LBAs in non-sequential order, store data in a buffer, and reorganize it into sequential order for return to the host, enabling uninterrupted read operations and efficient error recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is read in sequential order from data sectors, then data integrity is maintained, but read operation time increases and IOPS decreases
Solution Approach 1:
The system performs preliminary actions by reading data from all data sectors in parallel before any errors are detected. The host receives notification of completion and then the system determines which sectors contain errors, allowing error recovery to occur after the bulk read operation is already underway or complete.
Solution Approach 2:
The patent inverts the conventional approach by reading data in parallel from all sectors simultaneously rather than sequentially. Instead of reading sector by sector in order, the system initiates reads from multiple sectors at once, then handles error recovery for problematic sectors without halting the overall read operation.
2Reliability
If read operations halt for error recovery, then data accuracy is ensured, but read operation efficiency decreases
Solution Approach 1:
The system performs preliminary actions by reading data from all data sectors in parallel before any errors are detected. The host receives notification of completion and then the system determines which sectors contain errors, allowing error recovery to occur after the bulk read operation is already underway or complete.
Solution Approach 2:
The patent enables continuous read operations by allowing the main read process to proceed without halting for error recovery. Error recovery is performed separately for identified problematic sectors while the overall read operation maintains continuity, thus preserving both efficiency and reliability.
3Stability of the object's composition
If sequential LBA reading is performed, then data order is maintained, but operational interruptions increase
Solution Approach 1:
The system performs preliminary actions by reading data from all data sectors in parallel before any errors are detected. The host receives notification of completion and then the system determines which sectors contain errors, allowing error recovery to occur after the bulk read operation is already underway or complete.
Solution Approach 2:
The patent introduces an intermediary step where the host system acts as a mediator between the parallel read operations and the final data assembly. The host receives completion notifications, coordinates error recovery for specific sectors, and manages the reassembly of data in the correct LBA order, thus maintaining data order while minimizing interruptions.
Data Source
AI summary
Systems and methods are disclosed to perform out of order LBA processing at a data storage device. A data storage device may be configured to receive a read command including a sequential LBA range, read data for the LBA range in non-sequential order and store the data to a buffer, and return the data to the host in sequential LBA order. The storage device may begin a read operation at a sector in the middle of the LBA range, and read the beginning of the LBA range on a next rotation of the media. The storage device may note the location of read errors without interrupting a read operation. Successfully read data may be buffered, while rereads and error recovery may be performed only on LBAs at which errors were encountered. Once the data from the LBA range has been acquired, the data may be organized into sequential order.