User-Space I/O Capability Control for Reliable Flash Storage
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Solution Overview
Problem
Existing storage systems face inefficiencies in managing storage device operations, particularly in flash storage systems, due to the need for both higher and lower level processes, leading to redundant write operations and reduced reliability.
Innovation Solution
Implementing a direct-mapped flash storage system where higher level processes manage storage operations without lower level storage controllers, utilizing zones and allocation units to optimize data management and reduce redundant writes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both higher level processes and lower level storage controllers manage storage operations, then storage operations can be distributed, but redundant write operations increase and reliability decreases
Solution Approach 1:
The patent extracts the lower level storage controller from the storage management hierarchy, removing it as a separate management layer. The host processor directly manages flash storage devices without intermediary controllers, eliminating redundant write operations caused by multiple management layers while maintaining operational distribution through direct host-to-storage communication
Solution Approach 2:
The patent introduces a file system layer that acts as an intermediary between the host processor and flash storage devices. This file system manages allocation units and zones directly, replacing the traditional storage controller's management functions while enabling reliable write operations through centralized host control and eliminating the redundancy caused by multiple controllers
2Ease of operation
If traditional storage controllers are used to manage flash storage, then storage devices can be controlled, but redundant write operations occur and efficiency decreases
Solution Approach 1:
The patent merges the storage controller functions directly into the host processor, eliminating the separate storage controller layer. The host processor assumes direct control of flash storage devices through integrated file system management, reducing redundant write operations by consolidating control authority while maintaining ease of operation through unified host-based management
Solution Approach 2:
The patent enables the host processor to directly manage flash storage operations without external controllers. The file system implements self-service management of allocation units and zones, with the host processor handling all write operations directly to storage devices, eliminating the efficiency losses caused by controller-mediated redundant writes
Data Source
AI summary
A method, apparatus, and computer program product for managing permissions for processing input/output (I/O) operations in a storage system is disclosed that includes a plurality of storage system controllers and a plurality of storage devices. The method comprises determining that a permission associated with a storage system controller for issuing I/O operations to the storage devices should be invalidated and, in response to the determination, modifying at least one I/O capability of the storage system controller.