Storage Command Retry Messaging for Mixed-Latency Media
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Solution Overview
Problem
Existing storage devices experience performance degradation due to CPU stalls caused by varying access latencies between fast and slow storage media, leading to inefficiencies in processing data commands.
Innovation Solution
Implementing a storage device with a response engine that determines cache hits or misses and sends a retry message with estimated latency, allowing the host CPU to manage command buffers efficiently, reducing stalls by scheduling retry commands based on predicted latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the storage device uses fast storage medium for data access, then access speed is improved, but device complexity increases due to managing multiple storage media
Solution Approach 1:
The storage device is segmented into multiple storage media with different access speeds (fast and slow). The processor independently searches the fast storage medium first, and only accesses the slow storage medium when necessary. This segmentation allows the system to achieve high access speeds for frequently used data while maintaining the capability to store large amounts of data, thereby improving data access speed without proportionally increasing device complexity.
Solution Approach 2:
Different storage media are assigned different functional roles: the fast storage medium is optimized for quick data retrieval (local quality of speed), while the slow storage medium is optimized for大容量 storage (local quality of capacity). The processor selectively accesses each medium based on data location and access patterns, allowing each component to excel at its specific function rather than requiring all components to be equally complex.
2Device complexity
If the storage device uses slow storage medium for data access, then device complexity is reduced, but access latency increases causing CPU stalls
Solution Approach 1:
The processor performs preliminary action by first searching the fast storage medium before accessing the slow storage medium. This two-stage search approach allows the system to quickly determine whether data is available in the fast medium, avoiding unnecessary access to the slow medium and reducing access latency. The preliminary search in the fast medium acts as a filter that prevents CPU stalls by quickly identifying data location.
Solution Approach 2:
The fast storage medium acts as an intermediary between the processor and the slow storage medium. When data is needed, the processor first checks the fast medium (intermediary), and only accesses the slow medium if the data is not present. This intermediary layer reduces access latency by providing a buffer that the processor can query quickly, preventing CPU stalls without requiring the entire storage system to be complex.
3Reliability
If the processor searches both storage media for every command, then data access reliability is improved, but productivity decreases due to increased processing time
Solution Approach 1:
The search process is segmented into two distinct stages: first searching the fast storage medium, then conditionally searching the slow storage medium only if data is not found in the fast medium. This segmentation ensures data access reliability by systematically checking both media, while improving productivity by avoiding redundant searches in the slow medium when data is already present in the fast medium.
Solution Approach 2:
The processor performs preliminary action by searching the fast storage medium first before proceeding to the slow storage medium. This preliminary search in the fast medium quickly determines whether further searching is necessary, ensuring that data access reliability is maintained (both media are searched if needed) while productivity is improved (avoiding unnecessary searches in the slow medium).
Data Source
AI summary
Systems and methods for data command processing are disclosed. A storage device includes a first storage medium, a second storage medium, and a processor. The processor may be configured to: receive from a computing device a first command associated with first data; search the first storage medium for processing the first command; and based on the search of the first storage medium, transmit a message to the computing device. Based on a transmission of the message, the storage device may be configured to receive transmit a second command associated with the first data from the computing device.