Peer RAID Controller Reduces Host Overhead
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Solution Overview
Problem
Current data storage systems require host or intermediate resources for RAID configuration and control, adding complexity and overhead between the host system and storage devices.
Innovation Solution
Implementing a peer-to-peer communication channel among storage devices to enable a storage device to act as a master RAID controller, managing RAID configuration and control without relying on host or intermediate resources, using a processor, memory, and a non-volatile storage medium with a peer RAID controller for executing RAID operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a storage device acts as a master RAID controller using peer-to-peer communication, then device complexity and overhead are reduced, but communication reliability among peer devices becomes more critical
Solution Approach 1:
The patent introduces a peer-to-peer communication channel as an intermediary mechanism that enables direct communication between storage devices without requiring host or intermediate controller resources. This mediator layer handles RAID control messages and coordination protocols, allowing devices to autonomously manage RAID operations while maintaining communication reliability through dedicated communication pathways.
Solution Approach 2:
Storage devices are empowered to perform self-service RAID control operations by executing RAID controller logic locally. Each peer device can independently participate in RAID decision-making, data distribution, and recovery operations without external intervention, thereby eliminating the need for centralized controller overhead while maintaining system reliability through distributed intelligence.
2Adaptability or versatility
If RAID control is distributed among peer storage devices, then system scalability is improved, but coordination complexity among devices increases
Solution Approach 1:
The RAID control functionality is segmented and distributed across multiple peer storage devices rather than centralized in a single controller. Each device holds a portion of the RAID control logic and can independently execute segmented tasks such as local data striping, parity calculation, and error correction, enabling scalable system growth without proportionally increasing coordination complexity.
Solution Approach 2:
Each peer storage device is designed with universal capabilities to perform multiple RAID control functions simultaneously. Devices can act as both data storage units and RAID control participants, executing diverse operations including data I/O, parity generation, error recovery, and coordination messaging through a unified peer-to-peer interface, thereby simplifying coordination while enhancing scalability.
Data Source
AI summary
Example storage systems, data storage devices, and methods provide redundant array of independent disk (RAID) control among peer storage devices. A master storage device among peer storage devices receives host commands and determines, based on a peer RAID configuration, data blocks for redundantly storing the host data unit among the peer storage devices. The master storage device allocates the data blocks among the peer storage devices and sends them to the peer storage devices using a peer communication channel.