Connection Agents for Virtual Machine I/O Controller Management
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Solution Overview
Problem
In virtualization environments, managing I/O operations and storage devices efficiently across multiple virtual machines and physical host machines is challenging, particularly in ensuring high reliability, availability, and performance while handling different types of storage resources.
Innovation Solution
The implementation of a Controller/Service VM that manages all storage resources into a global logically-combined storage pool, utilizing connection agents to monitor and direct I/O controllers, ensuring seamless connection management and failover scenarios, thereby optimizing storage resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple virtual machines share computing resources on a single physical host machine, then resource utilization efficiency is improved, but connection management complexity increases
Solution Approach 1:
The patent introduces connection agents as intermediary components that run on each physical host machine to manage I/O controller connections. These agents act as mediators between virtual machines and the hypervisor, automatically monitoring controller status, detecting failures, and managing reconnections. This intermediary layer automates the complex connection management tasks, resolving the contradiction by maintaining high resource utilization while reducing the operational complexity through automated connection oversight and failover management.
2Ease of operation
If a designated default I/O controller is used for each virtual machine, then connection management is simplified, but system reliability decreases due to single point of failure
Solution Approach 1:
The patent implements a feedback mechanism where connection agents continuously monitor the status of I/O controllers and automatically detect failures. When a failure is detected, the system provides feedback by notifying the virtual machine and initiating reconnection to an alternative controller. This feedback loop maintains simplicity for the user while automatically ensuring reliability through real-time monitoring and failover, resolving the contradiction between ease of operation and system reliability.
Solution Approach 2:
The system prepares alternative I/O controllers in advance as backup options for each virtual machine. Before a failure occurs, the connection agent has already identified and configured alternative controllers that can take over if the designated default controller fails. This beforehand preparation cushions against potential failures, maintaining both operational simplicity and system reliability by having pre-configured failover options without requiring complex user intervention when failures occur.
3Reliability
If connection agents continuously monitor I/O controller status, then system reliability is improved through quick failure detection, but energy consumption increases
Solution Approach 1:
The connection agents perform status monitoring of I/O controllers at periodic intervals rather than continuously. This periodic action is sufficient to detect failures in a timely manner while significantly reducing energy consumption compared to continuous monitoring. The system balances reliability and energy efficiency by selecting monitoring intervals that are frequent enough to detect failures quickly but spaced out enough to conserve resources, resolving the contradiction between failure detection capability and energy consumption.
Data Source
AI summary
In one embodiment, a system for managing communication connections in a virtualization environment, comprises a plurality of host machines implementing a virtualization environment, wherein each of the host machines comprises a hypervisor, at least one user virtual machine (UVM), a connection agent, and an I/O controller; and a virtual disk comprising a plurality of storage devices, the virtual disk being accessible by all of the I/O controllers, wherein the I/O controllers conduct I/O transactions with the virtual disk based on I/O requests received from the UVMs, and wherein, for each of the host machines: each of the UVMs on the host machine sends its respective I/O requests to a selected one of the I/O controllers, and for each of the UVMs on the host machine, the connection agent on the host machine selected one of the I/O controllers for the UVM based on a list of the available I/O controllers.