RAID Controller Signal Management for SSD Parity Optimization
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Solution Overview
Problem
In data storage systems, particularly in SSDs, hot swapping of semiconductor chips is not feasible when one chip fails, leading to inefficiencies in RAID recovery and performance, as existing technologies do not effectively manage RAID operations and parity generation across multiple chips.
Innovation Solution
A data storage system and RAID controller that transmit a RAID configuration signal to manage RAID operations, allowing activation or deactivation of RAID operations, generate RAID parity, and control memory controllers to program data and parity across multiple memory chips, including error correction and health status reporting to optimize chip utilization and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RAID operations are performed using multiple memory chips, then data redundancy and reliability are improved, but device complexity and difficulty of managing RAID operations increase
Solution Approach 1:
The memory device performs RAID operations autonomously using its own internal resources (memory chips and controllers) without requiring external RAID controller hardware. The memory device self-manages parity generation, data distribution, and recovery operations, eliminating the need for complex external RAID management infrastructure.
Solution Approach 2:
The memory device integrates multiple functions including data storage, RAID operation execution, parity generation, and error recovery within a single device. The memory controllers can operate in both RAID and non-RAID modes, providing multi-functionality that simplifies the overall system architecture while maintaining reliability.
2Reliability
If spare area is allocated for RAID parity storage, then error recovery capability is improved, but storage capacity is reduced
Solution Approach 1:
The system dynamically adjusts the allocation of memory chips between data storage and parity storage based on operational needs. When RAID operations are activated, certain memory chips are designated for parity storage; when deactivated, all chips are used for data storage. This parameter change optimizes the balance between recovery capability and storage capacity.
Solution Approach 2:
The RAID configuration is made dynamic rather than static. The memory device can switch between RAID and non-RAID modes, and the allocation of memory resources for parity versus data can be adjusted based on the operational state, allowing flexible optimization of both reliability and storage capacity.
3Reliability
If hot swapping is implemented for failed chips, then system availability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The memory device performs self-recovery operations using its internal RAID capabilities when a chip fails. The system automatically detects failures, generates parity data, and reconstructs lost information without requiring external intervention or hot swapping mechanisms, maintaining availability while avoiding manufacturing complexity.
Solution Approach 2:
The system converts the potential harm of chip failures into a beneficial recovery process by using RAID parity stored within the same device. Instead of requiring replacement or hot swapping, the failed chip's data is reconstructed using parity information from other chips, turning a failure scenario into an automated recovery opportunity.
Data Source
AI summary
Provided are a data storage system, a data storage device and a RAID controller, which can control RAID operation and a RAID operating method of a memory device by transmitting a RAID configuration signal to the memory device. The data storage system includes a memory device that may include m nonvolatile memories, where m is a natural number, and a memory controller that may program data to at least the first to mth pages. The data storage system also includes a RAID controller that may generate a RAID configuration signal, including a RAID operation signal for determining whether to activate or deactivate a RAID operation of the memory device, and that may transmit the data and the RAID configuration signal to the memory controller. The memory controller may generate a RAID parity using first to (m−1)th data from the RAID controller and program the first to (m−1)th data to the first to (m−1)th pages and the RAID parity to the mth page when the RAID operation signal is activated, but program the first to mth data received from the RAID controller to the first to mth pages when the RAID operation signal is deactivated.