Storage Media Self-Healing via Recording Scheme Conversion
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Solution Overview
Problem
Storage systems face capacity and performance issues due to defects in storage media, leading to costly replacements or reduced functionality, as existing methods do not effectively maintain system capacity and performance without replacing faulty components.
Innovation Solution
Implementing a self-healing mechanism that converts a portion of the storage media from a first recording scheme to a second scheme with higher storage density, such as converting from conventional magnetic recording (CMR) to shingled magnetic recording (SMR), to maintain capacity and performance by selecting appropriate media based on factors like latency and data type, and utilizing a cache for staging and write absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If storage media is replaced to repair defects, then reliability is improved, but cost and time are increased
Solution Approach 1:
The storage system performs self-healing by automatically detecting defects and converting storage media between recording schemes without external intervention. The system monitors its own health status and executes recovery operations independently, eliminating the need for manual media replacement and reducing downtime.
Solution Approach 2:
The system performs preliminary defect detection and maintains a mapping between logical and physical storage locations before complete media failure occurs. By proactively identifying defects and preparing conversion operations in advance, the system prevents total system failure and avoids the need for immediate media replacement.
2Reliability
If storage media is replaced to repair defects, then reliability is improved, but cost is increased
Solution Approach 1:
Instead of discarding defective media, the system recovers usable capacity by converting remaining storage areas between recording schemes. Defective sectors are isolated and mapped around, allowing the system to recover and utilize previously unavailable storage capacity through scheme conversion rather than complete media replacement.
Solution Approach 2:
The system changes the recording scheme parameter of storage media to optimize capacity utilization. By converting between different recording schemes (e.g., from lower-density to higher-density schemes), the system recovers lost capacity without physical media replacement, effectively increasing the usable storage space.
3Quantity of substance
If conventional magnetic recording is used, then ease of manufacture is maintained, but storage density is limited
Solution Approach 1:
The system dynamically switches between different recording schemes based on operational needs and defect conditions. Rather than being locked into a single conventional scheme, the storage system can adaptively convert between recording schemes to optimize density while managing complexity through controlled transitions.
Solution Approach 2:
The system changes the recording scheme parameter to achieve higher storage density. By converting storage media from conventional magnetic recording to higher-density schemes, the system increases the quantity of stored data without proportionally increasing manufacturing complexity, as the conversion is performed through software-controlled parameter changes.
4Reliability
If storage capacity is reduced to accommodate defects, then reliability is maintained, but productivity is decreased
Solution Approach 1:
The system segments the storage media into defective and non-defective regions, then applies different recording schemes to each segment. By isolating defects to specific segments while maintaining full functionality of other segments, the system preserves overall storage capacity while ensuring reliability through targeted defect management.
Solution Approach 2:
The system changes the recording scheme parameter in response to detected defects to recover lost capacity. When defects are identified, the system converts remaining storage areas to higher-density schemes, dynamically adjusting the overall capacity parameter to compensate for defective regions and maintain productivity.
Data Source
AI summary
A storage system such as a hard disc drive (HDD), solid-state drive (SSD), hybrid drive (SSHD), storage rack, set of storage racks, JBOD, array of discs, etc. may include a variety of storage media. Failures may be detected in the storage media of the storage system. Such a failure may affect the physical capacity of the storage system. A storage controller of the storage system initiates a media conversion that converts a portion of the storage media from media storing data according to a first recording scheme to a media storing data according to a second recording scheme. The second recording scheme stores data at a higher density compared to the first recording scheme.