Dedupe-Aware Storage QoS I/O Scheduling
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Solution Overview
Problem
Current storage Quality of Service (QoS) solutions do not account for deduplicated data, leading to underutilization of storage resources due to the failure to consider the deduplication ratio in allocating Input/Output (I/O) requests, resulting in inefficient bandwidth usage.
Innovation Solution
Implement a dedupe-aware QoS system that detects the deduplication count and adjusts I/O request scheduling based on the deduplication ratio, allowing unused bandwidth from deduplicated data to be reassigned, thereby optimizing storage resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional QoS solutions allocate I/O requests based on assigned bandwidth without considering deduplication, then storage bandwidth is guaranteed per application, but storage resources are underutilized due to ignoring dedupe ratio
Solution Approach 1:
The system implements a feedback mechanism by monitoring deduplication ratios and dynamically adjusting I/O request scheduling. The QoS manager receives feedback about actual data written vs. deduplicated data stored, and uses this information to adjust bandwidth allocation and crediting in real-time, resolving the contradiction between maintaining QoS guarantees and optimizing storage utilization
Solution Approach 2:
The patent transforms the static bandwidth allocation model into a dynamic one where I/O scheduling parameters change based on deduplication performance. The system continuously adapts the crediting mechanism and request scheduling to reflect current dedupe ratios, allowing the system to maintain reliability while improving productivity through dynamic resource optimization
2Stability of the object's composition
If I/O requests are queued based on initial bandwidth assignment, then service level agreements are enforced, but additional storage bandwidth from deduplication is not allocated
Solution Approach 1:
The system changes the parameters of I/O request scheduling by introducing deduplication-aware crediting. Instead of using fixed bandwidth parameters, the system adjusts crediting parameters based on dedupe ratios, allowing additional bandwidth to be allocated while maintaining SLA compliance through modified scheduling parameters
3Loss of substance
If deduplication is performed to reduce storage space, then storage efficiency improves, but I/O scheduling does not account for deduplicated data leading to bandwidth loss
Solution Approach 1:
The patent converts the potential harm of deduplication (which makes I/O scheduling complex) into a benefit by using deduplication metrics to improve bandwidth utilization. The system uses dedupe count and ratio information to generate additional crediting, transforming the scheduling complexity into an opportunity for optimizing bandwidth allocation and reducing overall system waste
Data Source
AI summary
A system and method for implementing a Quality of Service based upon data deduplication is provided. The method may include deduplicating data and receiving a corresponding I/O request; wherein the data includes an associated dedupe count. The method may further include performing the I/O request based upon the dedupe count. For example, where no deduplication exists as indicated by a dedupe count of zero, the I/O request may be scheduled for processing when the sum of the current clock tick and the tag ratio are less than or equal to the next clock tick. In the alternative, where deduplication exists as indicated by a dedupe count that is greater than zero, the I/O request may be scheduled for processing, when the sum of the current clock tick, a negative value of the dedupe ratio, and the tag ratio are less than or equal to the next clock tick.