SAS Port Rate Determination for Bandwidth Optimization
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Solution Overview
Problem
In SAS standard, negotiating data transmission rates for physical channels within a port is challenging due to varying negotiated rates, leading to inefficient data transmission as the computer device often sets the lowest rate to avoid failures, resulting in suboptimal bandwidth utilization.
Innovation Solution
A method to determine the channel transmission rate for an SAS port by calculating the total port bandwidth for each negotiated rate, setting the rate corresponding to the largest bandwidth as the channel transmission rate, and disabling or adjusting channels with lower rates to balance load and reduce failure probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the computer device sets the channel transmission rate to the lowest negotiated rate to reduce data transmission failure probability, then reliability is improved, but total port bandwidth is reduced and data transmission efficiency deteriorates
Solution Approach 1:
The patent changes the parameter selection criterion from 'lowest negotiated rate' to 'negotiated rate corresponding to largest total port bandwidth'. The computer device calculates total port bandwidth for each negotiated rate option and selects the rate that maximizes overall bandwidth while maintaining reliability through dynamic channel selection.
Solution Approach 2:
The patent introduces dynamic channel selection where the computer device can adaptively choose different physical channels based on their negotiated rates and current transmission requirements. This dynamic approach allows the system to optimize bandwidth utilization while avoiding transmission failures by selecting appropriate channels for each data transmission task.
2Productivity
If the computer device sets the channel transmission rate to a high rate to improve data transmission efficiency, then productivity is improved, but data transmission failure probability increases
Solution Approach 1:
The patent changes the rate selection parameter from fixed high rate or lowest rate to an optimized rate determined by total port bandwidth calculation. This allows the system to select the most appropriate transmission rate that balances speed and reliability based on the actual capabilities of available physical channels.
Solution Approach 2:
The patent implements dynamic rate selection where the computer device can adjust the channel transmission rate based on the specific requirements of data transmission tasks and the current state of physical channels. This dynamic adjustment enables the system to achieve high transmission efficiency while maintaining reliability by matching transmission rates to channel capabilities.
3Productivity
If multiple physical channels with different negotiated rates are integrated into one port, then bandwidth utilization is improved, but device complexity increases due to rate negotiation and channel management
Solution Approach 1:
The patent merges multiple physical channels with different negotiated rates into a single logical port interface. The computer device manages the complexity internally by calculating total port bandwidth across all channels and selecting the optimal transmission rate, presenting a simplified interface to upper layers while maximizing bandwidth utilization.
Solution Approach 2:
The patent implements self-service mechanisms where the computer device automatically performs rate negotiation and channel selection without external intervention. The system autonomously calculates total port bandwidth for different rate options and determines the optimal configuration, reducing the burden on external control systems while improving bandwidth utilization.
Data Source
AI summary
A method and apparatus for determining a port rate determines a channel transmission rate of an SAS port including N physical channels. The method includes: determining M different negotiated rates of the N physical channels; separately determining M total port bandwidths corresponding to the M different negotiated rates; and determining a negotiated rate corresponding to a largest total port bandwidth in the M total port bandwidths as a channel transmission rate of the port. A lowest negotiated rate is no longer used as the channel transmission rate of the port, but the negotiated rate corresponding to the largest total port bandwidth is determined as the channel transmission rate of the port.