CSI Filter Driver for Legacy Storage in Container Clusters
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Solution Overview
Problem
Existing storage systems face inefficiencies in managing storage operations, particularly in flash storage systems, where lower-level processes often handle tasks that could be managed by higher-level processes, leading to unnecessary write operations and reduced reliability.
Innovation Solution
Implementing a direct-mapped flash storage system where the operating system directly addresses data blocks without translation by storage controllers, offloading device management responsibilities, and utilizing zoned storage devices to optimize data allocation and garbage collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If storage controllers translate and manage data blocks, then storage operations can be controlled, but redundant write operations increase and reliability decreases
Solution Approach 1:
The patent extracts the data block translation function from the storage controller and places it directly in the operating system. The OS now directly addresses data blocks without requiring translation by the storage controller, eliminating redundant write operations and improving reliability.
Solution Approach 2:
The patent introduces a filter driver as an intermediary layer between the container storage interface and the block storage interface. This filter driver translates containerized storage operations into non-containerized block storage operations, enabling legacy storage systems to work with containerized applications without requiring full controller translation.
2Productivity
If lower-level processes handle storage tasks, then device management is maintained, but data management efficiency decreases
Solution Approach 1:
The patent inverts the traditional storage management hierarchy by having the operating system (higher level) directly manage data blocks instead of the storage controller (lower level). This inversion allows the OS to handle data management more efficiently while the storage controller focuses on physical device management.
3Adaptability or versatility
If traditional storage systems are used with containerized applications, then compatibility is maintained, but storage operation optimization is lost
Solution Approach 1:
The filter driver acts as a translator between containerized storage interfaces and traditional block storage interfaces, allowing legacy storage systems to work with modern containerized applications while maintaining optimization opportunities.
Solution Approach 2:
The patent segments the storage interface into multiple layers: the container storage interface at the application level, the filter driver in the middle for translation, and the block storage interface at the device level. This segmentation allows each layer to operate independently with optimized functions.
Data Source
AI summary
A method includes receiving, by a container storage interface (CSI) filter driver executing on a node of a container-based cluster managed by a container orchestrator, a request to perform a storage system-based control plane operation associated with a containerized application executing on the node; determining, by the CSI filter driver, that the storage system-based control plane operation is to be performed with respect to a legacy storage system configured to store data for one or more non-containerized applications; and generating, by the CSI filter driver based on the determining that the storage system-based control plane operation is to be performed with respect to the legacy storage system, a command configured to direct a storage interface driver associated with the legacy storage system to perform the storage system-based control plane operation.