RAID Bad Block Remapping Pool Across Disk Array
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Solution Overview
Problem
Current hard drive systems face challenges in managing bad blocks across multiple disks, as the reserved space for remapping can be insufficient, leading to data integrity issues and the need for frequent drive replacements, especially as disk sizes increase.
Innovation Solution
A method and system that form a remapping pool across multiple disks, using a storage controller to identify and remap bad blocks across the array, ensuring data is stored across multiple disks, thereby expanding the available space for remapping and utilizing it uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reserved location is provided within each hard drive for remapping bad blocks, then bad blocks can be remapped within the drive, but the reserved space is insufficient for large disk drives and may not accommodate all bad blocks
Solution Approach 1:
The patent merges the remapping resources of multiple hard drives into a shared remapping pool. Instead of each drive having its own isolated reserved space, the system combines the reserved spaces from multiple drives to create a common pool that can be shared across the entire RAID array, thereby increasing the total available remapping capacity.
Solution Approach 2:
The remapping pool serves multiple functions: it acts as the remapping target for bad blocks from any drive in the array, and it utilizes capacity from multiple drives that would otherwise be partially unused. This universal resource can handle remapping needs for any drive in the consortium, making the system more flexible and efficient.
2Reliability
If the area used for remapping bad blocks increases with disk drive size, then larger drives can remap more bad blocks, but the reserved location may be largely unused in some drives while insufficient in others
Solution Approach 1:
The patent combines the underutilized reserved spaces from multiple drives into a single shared remapping pool. This merging allows the system to achieve uniform utilization across all drives by pooling resources, rather than each drive independently managing its own potentially underutilized reserved space.
Solution Approach 2:
The remapping pool provides dynamic resource allocation where the remapping capacity is not fixed to individual drives but can be flexibly allocated to any drive in the array that needs remapping. This dynamic approach allows the system to adapt to varying remapping needs across different drives.
3Reliability
If multiple hard drives are used in an information handling system, then storage capacity and reliability are improved, but the inconsistency in reserved location utilization across drives reduces overall efficiency
Solution Approach 1:
The patent merges the remapping resources from multiple independent hard drives into a unified shared pool. This consolidation allows the system to efficiently utilize the collective remapping capacity of all drives, eliminating the waste associated with inconsistent individual drive utilization while maintaining the reliability benefits of multiple drives.
Data Source
AI summary
A system and method for managing bad blocks that utilizes a remapping pool formed across an array of disks to remap bad blocks formed on individual disks. When a bad block is discovered in a particular disk the bad block is then remapped within the remapping pool and is stored across multiple disks.