Load Balancer Bypass Management During Virtual Machine Live Migration
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Solution Overview
Problem
Managing East West traffic bypasses during live migration of virtual machines in datacenters is challenging, as existing systems generate unnecessary notifications to all hosts, leading to inefficiencies and negative impacts on throughput.
Innovation Solution
A bypass data structure is maintained to associate source and destination virtual machine identification information with host information, allowing updates only when live migration occurs, ensuring seamless traffic bypass and minimizing unnecessary notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If notifications are generated to all hosts during live migration, then the bypass can be maintained, but unnecessary notifications increase system overhead and reduce throughput
Solution Approach 1:
The patent segments the host notification process by introducing a control plane separation. The SDN controller maintains the bypass data structure and manages migration notifications centrally, while only affected hosts receive updates. This segmentation prevents unnecessary notifications to all hosts, maintaining bypass reliability while reducing system overhead and preserving throughput.
2Productivity
If a bypass data structure is maintained with migration information, then updates can be minimized to only relevant hosts, but data structure management complexity increases
Solution Approach 1:
The patent introduces an intermediary bypass data structure maintained by the SDN controller that acts as a mediator between the migration process and host notifications. This data structure stores source host ID, destination host ID, VM ID, and VIP information, enabling the controller to efficiently determine which hosts need updates without increasing overall system complexity.
3Productivity
If East West traffic bypass is maintained during migration, then traffic flow efficiency is improved, but managing the bypass through migration presents challenges
Solution Approach 1:
The patent implements a feedback mechanism where the SDN controller monitors VM migration events and automatically updates the bypass data structure. When migration is detected, the controller retrieves the VIP from the data structure and programs the appropriate hosts to maintain the bypass, providing automated feedback that simplifies bypass management while preserving traffic flow efficiency.
Data Source
AI summary
Methods, systems, and devices are described herein for managing a load balancer bypass between two virtual machines through live migration of at least one of the virtual machines. In one aspect, a load balancer bypass may be established between a source virtual machine associated with a source host and a destination virtual machine associated with a destination host. The source virtual machine identification information, source host identification information, destination virtual machine identification information, and destination host identification information may be associated with an indication of whether the bypass is active, for example, in a bypass data structure. Upon a determination that live migration of at least one of the source virtual machine or the destination virtual machine has been completed to a third host, the bypass data structure may be updated with identification information of the third host to maintain the load balancer bypass after completion of the live migration.