SSD Internal Channel Multiplexing for Fair Data Transfers
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Solution Overview
Problem
In high-performance computing environments, the communication protocol between the SSD controller and storage devices introduces fairness issues, causing disproportionate bandwidth allocation to program data transfers, which can lead to slower performance for other operations, and increasing power consumption is not a viable solution.
Innovation Solution
The SSD controller breaks down program data into smaller chunks and transfers them sequentially, interspersing higher priority operations between chunks to ensure fair allocation of channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the SSD controller allocates disproportionate bandwidth to program data transfers, then program operation speed is improved, but other operations experience slower performance and fairness issues arise
Solution Approach 1:
The patent segments the communication channel into multiple virtual channels (read channel, write channel, trim channel) that can operate independently. Program data transfers are confined to the write channel, while other operations use their dedicated channels, preventing any single operation type from monopolizing the entire channel bandwidth and thus maintaining overall system throughput while improving program operation speed.
Solution Approach 2:
The patent introduces a new dimension of channel management by implementing multiple virtual channels within the physical channel. This dimensional transformation allows simultaneous independent operations of different types (read, write, trim) that were previously competing for the same single channel, resolving the fairness issue while maintaining high program operation speed.
2Productivity
If power consumption is increased to improve performance, then bandwidth allocation fairness is improved, but power consumption becomes unacceptable
Solution Approach 1:
The patent implements dynamic channel allocation where the controller can adjust the allocation of channel resources based on operation priorities and channel utilization. The virtual channel mechanism allows the system to dynamically switch between different operation types without increasing power consumption, achieving fairness through intelligent resource management rather than brute-force power increases.
3Device complexity
If other operations wait for program data transfers to complete, then channel resource allocation is simplified, but waiting time increases
Solution Approach 1:
By segmenting the channel into multiple virtual channels, the patent allows other operations to proceed simultaneously on their dedicated channels rather than waiting for program data transfers on the write channel. This segmentation eliminates the sequential dependency and reduces waiting time while maintaining manageable complexity through structured channel management.
Solution Approach 2:
The virtual channel mechanism ensures continuous useful action by allowing read, write, and trim operations to proceed concurrently on their respective channels. Other operations do not need to wait for program data transfers to complete because they can execute simultaneously on independent channels, eliminating idle waiting time while maintaining organized resource allocation.
Data Source
AI summary
A method performed by a solid state drive is described. The method includes, on a channel that internally couples a controller of the solid state drive to a storage device of the solid state drive, sending write data for a program operation to be performed by one of the storage device's logical units in separate chunks over the channel. The method also includes inserting higher priority traffic items of other logical units of the storage device in between the separate chunks.