Host Diagnostic Access for Isolated Storage Mirroring Networks
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Solution Overview
Problem
In storage system environments, hosts cannot directly retrieve diagnostic parameters from isolated storage area networks used for data mirroring, limiting their ability to diagnose and manage mirroring operations effectively.
Innovation Solution
A method and system where a host requests and receives read diagnostic parameters from a storage controller for a second storage area network, allowing the host to determine the status of mirroring paths and isolate faults within the network, even if the second network is isolated from the host.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hosts cannot directly retrieve diagnostic parameters from isolated storage area networks, then network security and isolation are maintained, but the ability to diagnose and manage mirroring operations is limited
Solution Approach 1:
The patent introduces a mediator mechanism where the storage controller acts as an intermediary between the host and the isolated second SAN. The host sends requests to the storage controller, which then retrieves diagnostic parameters from the isolated network and returns them to the host. This allows diagnostic access without compromising network isolation or security.
Solution Approach 2:
The patent segments the diagnostic function from the data mirroring function. The diagnostic parameter retrieval is separated into a distinct request-response mechanism that operates independently from the actual data mirroring operations, allowing hosts to obtain diagnostic information without directly accessing the isolated network.
2Difficulty of detecting and measuring
If hosts can access diagnostic parameters from isolated networks, then fault isolation and path selection improve, but network security and isolation may be compromised
Solution Approach 1:
The storage controller serves as a secure intermediary that mediates all access to the isolated second SAN. It authenticates and authorizes host requests before retrieving diagnostic parameters, ensuring that network isolation security is maintained while still enabling fault detection and path selection capabilities.
Solution Approach 2:
The system implements a feedback mechanism where the storage controller retrieves diagnostic parameters from the isolated network and feeds them back to the host. This allows the host to make informed decisions about path selection and fault management without directly accessing the isolated network, maintaining security while improving detectability.
3Measurement precision
If direct host access to second SAN diagnostic parameters is allowed, then diagnostic precision improves, but system complexity and security management increase
Solution Approach 1:
The storage controller as intermediary simplifies the system architecture by centralizing the diagnostic parameter retrieval logic. Rather than giving hosts direct access to multiple isolated networks, all diagnostic requests are funneled through the storage controller, which manages the complexity of communicating with the isolated second SAN.
Data Source
AI summary
A host is configured to communicate with a storage controller over a first storage area network. A request is transmitted from the host to the storage controller to provide read diagnostic parameters of a second storage area network that is used to mirror data controlled by the storage controller to another storage controller. The host receives the read diagnostic parameters of the second storage area network from the storage controller.