Data Migration in Storage Drives for Failed Write Requests
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Solution Overview
Problem
In data storage systems, failed write requests lead to unreliable data consistency, requiring extensive repair processes that consume resources and time, often resulting in unnecessary drive replacement and overprotection, which degrades system efficiency and performance.
Innovation Solution
A method for migrating data from failed groups to reserved groups within a drive, redirecting read/write requests based on a mapping relationship, thereby avoiding the need for full drive repair and replacement, and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is migrated from failed groups to reserved groups within the drive, then system performance and efficiency are improved by avoiding full drive replacement, but data reliability may be compromised by using internal reserved space instead of replacing the entire drive
Solution Approach 1:
The drive is segmented into multiple groups, and only the failed groups are migrated to reserved groups rather than replacing the entire drive. This granular approach allows selective data migration, maintaining system efficiency while preserving data reliability by isolating only the affected segments.
Solution Approach 2:
Reserved groups are pre-allocated within the drive before failures occur. When failures are detected, data can be immediately migrated to these pre-prepared reserved groups without requiring full drive replacement, thus improving system efficiency while maintaining data reliability through proactive preparation.
2Reliability
If full drive repair and replacement is performed, then data reliability is ensured through complete system replacement, but computing costs and time consumption increase significantly
Solution Approach 1:
Only the failed groups are extracted and migrated to reserved groups, leaving the rest of the drive operational. This selective extraction approach ensures data consistency for the affected groups while avoiding the time-consuming process of complete drive replacement, thus reducing repair time while maintaining reliability.
Solution Approach 2:
Instead of performing complete drive replacement (excessive action), only the necessary failed groups are migrated (partial action). This minimizes the scope of the repair operation, reducing both computing costs and time consumption while still ensuring data reliability for the affected portions.
3Reliability
If drive replacement is performed for failed write requests, then data consistency is maintained through complete system replacement, but hardware costs and system downtime increase
Solution Approach 1:
Data from failed groups is copied to reserved groups within the same drive rather than replacing the entire drive with new hardware. This copying approach maintains data consistency while preserving existing hardware resources, reducing both hardware costs and system downtime associated with drive replacement.
Solution Approach 2:
Instead of discarding the entire drive, only the failed groups are discarded and their data is recovered in the reserved groups. This selective approach maintains data consistency while recovering and reusing the majority of the drive's hardware resources, reducing hardware costs and downtime.
Data Source
AI summary
Data is migrated. For instance, in response to detection of a failed group in a drive of groups comprising respective blocks, it is determined whether the total number of groups in the drive that have failed is less than a predetermined threshold. Data associated with the failed group is migrated to a reserved group in a reserved space of the drive according to a determination that the total number is less than the predetermined threshold; and a read/write (I/O) request to the failed group is redirected to the reserved group based on a mapping relationship from the failed group to the reserved group. Consequently, data does not need to be repaired on an entire drive due to one failed write request and replacing the drive is avoided, thereby saving resources, time and labor, and improving the impact of the failed write request on the performance of a storage system.