RAID Cache Backup Using Disk Security Areas During Recovery
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Solution Overview
Problem
Existing RAID systems face data loss in cache during restoration due to faulty disks or controllers, leading to operating system failures and user data loss.
Innovation Solution
Implementing a security area in disks to back up cache data, allowing data to be restored from the security area after system restoration, and ensuring data consistency before flushing to avoid loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cache data is cleared before disk restoration to ensure data compatibility, then the data consistency between new disks and cache is improved, but the cache data is lost
Solution Approach 1:
The patent applies preliminary action by detecting the offline status of the RAID system and proactively copying cache data to disks before restoration operations begin. This ensures cache data is preserved and can be restored later, avoiding data loss while maintaining compatibility during the restoration process
Solution Approach 2:
The patent implements copying by creating a backup copy of cache data on disk storage. The cache data is copied to disks when the RAID system is detected as offline, and this copied data is later restored to the cache after restoration, preserving the original cache data while enabling safe restoration operations
2Productivity
If the RAID controller is directly replaced to restore the offline RAID system, then the restoration speed is improved, but the original data in the cache is lost
Solution Approach 1:
The patent applies preliminary action by detecting the offline status and copying cache data to disks before the RAID controller is replaced. This preliminary data preservation enables the new controller to restore cache data after installation, maintaining both fast restoration and data preservation
Solution Approach 2:
The patent implements copying by creating a backup of cache data on disk storage before controller replacement. The copied cache data is then restored by the new controller after it takes over, ensuring no data loss occurs during the controller replacement process
3Loss of information
If the data in the cache is not cleared before disk restoration, then the cache data is preserved, but the data in new disks may be incompatible with data in the cache
Solution Approach 1:
The patent implements copying by creating a backup copy of cache data on disk storage. This copied data serves as a reference during restoration, allowing the system to verify and maintain data compatibility while preserving the original cache data for later restoration
Solution Approach 2:
The patent applies feedback by detecting the offline status of the RAID system and using this information to trigger cache data copying operations. The system continuously monitors RAID status and adjusts cache management operations based on the detected state, ensuring data compatibility is maintained while preserving cache data
Data Source
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AI summary
A data restoration method and a related device are provided. To avoid a data loss in a cache in a process of restoring an offline RAID system, a security area is configured in a disk, where the security area is used to back up data in the cache of a RAID controller after the RAID system is offline. Therefore, when a first instruction used to indicate that the RAID system is offline is obtained, the data in the cache may be backed up to the security area. In this way, after the RAID system is restored, the RAID system can obtain backup data of the data in the cache from the security area, to avoid problems such as an operating system startup failure or a user data loss caused by the data loss in the cache.