Hot Plug Interface Control for Computing Resources
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Solution Overview
Problem
Current computing devices lack the ability to add and remove processors, memory, and I/O hubs while running, limiting their reliability, availability, and scalability.
Innovation Solution
The implementation of hot plug modules and a midplane with couplers and communication interfaces that allow for the detachable coupling of resources such as processors, memory, and I/O hubs, enabling hot plug addition and removal without rebooting, along with a state diagram and method for managing these operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot plug addition and removal of processors, memory, and I/O hubs is enabled, then reliability, availability, and scalability are enhanced, but device complexity increases
Solution Approach 1:
The system is divided into modular components (processors, memory modules, I/O hubs) that can be independently added or removed. Each component has a standardized interface with couplers that enable hot plug operations. The midplane is segmented into multiple couplers that can be independently controlled, allowing selective addition/removal of specific modules without affecting the entire system.
Solution Approach 2:
A hot plug interface controller is introduced as an intermediary component between the user and the hot plug operation. This controller manages the complex procedures of adding/removing modules, handles resource allocation, maintains cache coherency through snoop transactions, and coordinates with the operating system. The intermediary abstracts the complexity from the user while enabling hot plug functionality.
2Productivity
If hot plug operations are implemented without rebooting, then availability increases, but system stability may be compromised
Solution Approach 1:
Before allowing hot plug addition, the system performs preliminary actions including: flushing pending transactions, completing snoop requests, allocating resources in advance, and establishing proper initialization sequences. The hot plug interface controller prepares the system state beforehand to ensure that module addition/removal can proceed without causing instability or requiring reboots.
Solution Approach 2:
The system implements feedback mechanisms where the hot plug interface controller continuously monitors system state during hot plug operations. Snoop transactions provide feedback about cache coherence status, and the controller adjusts its behavior based on this feedback to maintain system stability. The controller coordinates with the operating system based on real-time system conditions.
3Loss of information
If cache coherency is maintained during hot plug operations, then data integrity is preserved, but performance overhead increases
Solution Approach 1:
The snoop transaction mechanism maintains cache coherency by continuously monitoring and updating cache states during hot plug operations. Instead of stopping all memory transactions to ensure coherency, the system allows transactions to continue while using snoop requests to coordinate cache invalidations and updates. This continuous approach preserves data integrity without completely halting system operation.
Data Source
AI summary
Hot plug modules comprising processors, memory, and/or I/O hubs may be added to and removed from a running computing device without rebooting the running computing device. The hot plug modules and computing device comprise hot plug interfaces that support hot plug addition and hot plug removal of the hot plug modules.