Staging Sorted Data Blocks in Shingled Magnetic Recording Storage
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Solution Overview
Problem
Data storage systems face high latency in accessing randomly targeted locations, particularly in shingled magnetic recording regions, which hampers data transfer rates due to the need for sequential writing and rewriting of data, leading to inefficiencies in managing logical and physical data ordering.
Innovation Solution
A method and processor-implemented process that sorts incoming write data blocks in random access memory and writes them as individually sorted data block sets to a staging area, optimizing data segregation across multiple levels of physical storage, thereby reducing latency and improving data transfer efficiency by aligning logical and physical ordering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data is written to randomly targeted locations in physical storage, then data can be stored flexibly according to logical ordering, but access latency increases significantly due to seek operations
Solution Approach 1:
The patent applies preliminary action by sorting incoming write data blocks in random access memory before writing them to the staging area. This pre-sorting ensures that data blocks are arranged in physically sequential order before being written to magnetic storage, so that subsequent read operations can access the data sequentially without requiring seek operations between random locations.
2Speed
If data blocks are written sequentially to physical storage, then data transfer rate increases, but the system cannot accommodate random write requests from hosts
Solution Approach 1:
The patent introduces a staging area as an intermediary between random access memory and the final magnetic storage locations. The storage controller receives random write requests from hosts, writes the data blocks to the staging area in sequential order, and then relocates them to their final destinations. This intermediary staging area decouples the random write interface from the sequential write requirement of magnetic storage, allowing both random write capability and sequential write performance to coexist.
3Device complexity
If data is stored directly in final locations without intermediate staging, then storage operations are simpler, but data access efficiency decreases due to repeated seek operations
Solution Approach 1:
The patent segments the storage operation into distinct phases: (1) receiving write requests and storing data blocks in random access memory, (2) sorting the data blocks in the staging area based on their physical location requirements, and (3) relocating the sorted data blocks to their final storage destinations. This segmentation allows the system to optimize each phase independently, achieving both operational simplicity and high data access efficiency.
Data Source
AI summary
A data storage system includes data storage and random access memory. A sorting module is communicatively coupled to the random access memory and is configured to sort data blocks of incoming write data received in the random access memory. A storage controller is communicatively coupled to the random access memory and the data storage and is configured to write the sorted data blocks as individually-sorted data block sets to a staging area of the data storage. A method and processor-implemented process provide for sorting data blocks of incoming write data received in a random access memory of data storage and writing the sorted data blocks as individually-sorted data block sets to a staging area of the data storage.