Storage I/O Throughput Control via Command Slot Monitoring
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Solution Overview
Problem
Current information handling systems face challenges in efficiently managing input/output operations at storage devices, leading to increased latency and decreased system performance due to variations in throughput and command slot utilization.
Innovation Solution
A method is introduced that queries a storage device for its maximum number of command slots, adjusts the throughput of input/output operations based on pending operations relative to these slots, and dynamically adjusts the processing rate to maintain optimal performance by switching between different throughput levels when approaching or exceeding the threshold of available command slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high throughput of I/O operations is provided to the storage device, then system productivity is improved, but the risk of exceeding command slot capacity increases causing latency
Solution Approach 1:
The system continuously monitors the number of pending I/O operations and compares it against the maximum command slots. Based on this feedback, it dynamically adjusts the throughput of incoming I/O operations to maintain optimal performance without exceeding storage device capacity
Solution Approach 2:
The I/O throughput is made dynamic rather than static. The system switches between different throughput levels (first throughput and second throughput) based on real-time conditions, specifically adjusting the rate of I/O operation submission to match storage device processing capacity
2Productivity
If the number of pending I/O operations is increased to maximize utilization, then productivity improves, but system reliability deteriorates when command slot capacity is exceeded
Solution Approach 1:
The system proactively queries the storage device to identify the maximum number of command slots before initiating I/O operations. This preliminary knowledge allows the system to configure its I/O submission strategy in advance, preventing capacity overflow before it occurs
Solution Approach 2:
The system continuously monitors pending I/O operations and adjusts throughput based on real-time status, ensuring reliable operation by maintaining pending operations within safe thresholds
Data Source
AI summary
Managing I/O operations at a storage device, including querying storage device to identify a maximum number of command slots associated with the storage device; providing, to the storage device and at a first throughput, a first set of input/output (I/O) operations for processing at the storage device; updating, based on the first set of I/O operations, a log indicating a number of pending I/O operations to be performed at the storage device; comparing the pending number of I/O operations to the maximum number of command slots of the storage device; determining, based on the comparing, that the pending number of I/O operations is within a first threshold of the maximum number of command slots of the storage device, in response: providing, to the storage device and at a second throughput, a second set of I/O operations for processing at the storage device, the second throughput less than the first throughput.