VM Live Migration via Multipath Network Path Aggregation
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Solution Overview
Problem
Virtual machine (VM) live migration is often limited by the time it takes to migrate the VM state over a migration network link, as existing methods do not effectively utilize additional CPU cycles and network paths to enhance migration speed.
Innovation Solution
The method involves calculating an estimated migration time and comparing it to a threshold, with the option to add additional CPU processing cycles and network paths, such as multipath TCP and unused network interface cards, to aggregate bandwidth and reduce migration time, and dynamically allocate and deallocate resources as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single network path is used for VM migration, then network complexity is low, but migration time is long
Solution Approach 1:
The network path is segmented into multiple parallel paths (primary path and secondary path) to enable simultaneous data transmission through multiple routes. This segmentation allows the migration bandwidth to be divided and transmitted concurrently across multiple paths, reducing total migration time without requiring a single complex high-capacity path.
Solution Approach 2:
The solution transitions from a single-dimensional network path to a multi-dimensional path structure by introducing multipath TCP and additional network interfaces. This dimensional expansion allows data to flow through multiple concurrent paths, effectively increasing the migration bandwidth and reducing migration time.
2Productivity
If additional network paths are added to increase migration speed, then migration time is reduced, but network configuration complexity increases
Solution Approach 1:
The multipath TCP library provides a universal interface that handles multiple network paths through a single API. This multi-functionality allows the system to manage complex multi-path configurations without increasing operational complexity, as the library abstracts the underlying path management details and provides unified control for bandwidth aggregation.
Solution Approach 2:
The multipath TCP library acts as an intermediary between the VM migration process and the underlying network infrastructure. It mediates the complexity by providing a standardized interface for path selection, bandwidth aggregation, and fault tolerance, thereby enabling high migration speeds without exposing the complexity of multi-path configuration.
3Loss of time
If CPU processing cycles are increased to accelerate migration, then migration time is reduced, but energy consumption increases
Solution Approach 1:
Instead of continuously maximizing CPU processing cycles, the system applies partial action by utilizing CPU cycles intermittently - specifically during path selection, bandwidth measurement, and migration initiation phases. During the actual data transfer, the system leverages network bandwidth aggregation rather than continuous CPU processing, thereby reducing overall energy consumption while maintaining fast migration speeds.
Data Source
AI summary
An estimated time to migrate a VM from a source hypervisor to a target hypervisor is calculated. The estimated time is compared to a threshold time and based on the estimated time meeting the threshold time, a migration of the VM from the source hypervisor to the target hypervisor via the network is initiated. Based on the estimated time not meeting the threshold time, it is determined whether an additional path can be added to the network between the source hypervisor and the target hypervisor. If an additional path cannot be added to the network, a migration of the VM from the source hypervisor to the target hypervisor via the network is initiated. If an additional path can be added to the network, the additional path is added and the migration via the network is initiated.