Dynamic Logical Storage Capacity Adjustment for Drives

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Solution Overview

Problem

Storage drives in RAID systems deteriorate with age and wear, leading to reduced performance and increased failure rates if not reassigned, as they cannot maintain initial performance specifications, making them unsuitable for certain workloads and reducing their life cycles.

Innovation Solution

A method and system that monitor storage drive characteristics such as age and wear, dynamically reclassify them by adjusting performance classes and logical storage capacity, and reorganize them within RAID arrays and storage tiers to ensure drives of similar performance are grouped together, thereby extending their useful life and reducing failure rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If storage drives are continuously used in RAID arrays without reassignment, then initial storage capacity and performance are maintained, but failure rates increase and life cycle is reduced due to age and wear

Engineering Contradiction:

Improvefailure rateVSAvoidlife cycle

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The system dynamically adjusts the logical storage capacity assigned to storage drives based on their age and wear characteristics. As drives age, the system reduces their allocated capacity and reassigns them to less demanding RAID arrays, transforming the static capacity allocation into a dynamic adaptation process that responds to drive conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of storage drives by modifying their logical storage capacity assignments. Drives transition from full-capacity operation to reduced-capacity operation as they age, with the system periodically reassessing and adjusting capacity parameters to match current drive performance capabilities

Inventive Principle:

Principle #35Parameter changes

2Reliability

If storage drives are reassigned based on age and wear, then failure rates are reduced and life cycle is extended, but system complexity increases due to monitoring and reorganization requirements

Engineering Contradiction:

Improvefailure rateVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system implements continuous monitoring of storage drive characteristics (age, wear, performance metrics) and uses this feedback to automatically adjust capacity assignments. The feedback loop periodically assesses drive conditions and triggers reassignment actions when thresholds are met, enabling automated adaptation without manual intervention

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs self-management by automatically monitoring drive health, determining capacity adjustments, and executing reassignment operations. The storage management system serves itself by making intelligent decisions about drive allocation based on monitored conditions, reducing the need for external management overhead

Inventive Principle:

Principle #25Self-service

3Reliability

If logical storage capacity is reduced for aging drives, then drive life is extended and reliability improves, but total storage capacity of the system decreases

Engineering Contradiction:

Improvedrive lifeVSAvoidtotal storage capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The system applies partial capacity reduction to individual aging drives rather than uniformly reducing all drive capacities. By selectively adjusting capacity only for drives that have reached certain age or wear thresholds, the system extends their useful life while minimizing the overall impact on total system storage capacity

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system segments the storage drive population into different capacity classes based on age and wear characteristics. Aging drives are moved to lower-capacity assignments while newer drives maintain full capacity, creating segmented capacity allocation that optimizes both reliability and total usable capacity across different drive cohorts

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11137915B2Dynamic logical storage capacity adjustment for storage drives

Publication Date: 2021.10.05 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A method for dynamically altering logical storage capacity within multiple storage drives is disclosed. In one embodiment, such a method monitors, within a storage environment, characteristics (e.g., age, wear, etc.) of multiple storage drives. Each storage drive has an amount of overprovisioning associated therewith. Based on the characteristics, the method periodically modifies a logical storage capacity of the storage drives in order to alter the amount of overprovisioning. The method then reorganizes the storage drives within various storage groups (e.g., RAID arrays, storage tiers, workloads, etc.) based on their logical storage capacity. For example, the method may place, as much as possible, storage drives of the same logical storage capacity within the same storage groups. A corresponding system and computer program product are also disclosed.