Dummy VM Precheck for Reliable Hybrid Cloud Migration
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Solution Overview
Problem
Existing precheck methods for live storage migrations in hybrid cloud deployments fail to reliably uncover issues, leading to disruptions during VM migrations due to complex network and storage configuration variations across clusters.
Innovation Solution
A method involving the instantiation of a dummy VM with matching configurations to the target VM, followed by a migration to a destination host, and verification of communication and performance metrics to ensure seamless transitions, along with customized and default precheck tasks to validate compatibility and resource availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional precheck methods are used for live storage migrations, then the migration process can be initiated, but reliability is insufficient leading to disruptions during VM migrations due to complex network and storage configuration variations
Solution Approach 1:
The patent performs preliminary actions by instantiating a dummy VM and executing a dry-run migration before the actual VM migration. This pre-check process validates network connectivity, storage accessibility, and configuration compatibility in advance, identifying potential issues before they affect production workloads and thereby improving migration reliability.
Solution Approach 2:
The dummy VM serves as an intermediary test object between the migration planning stage and actual VM migration. It acts as a mediator that validates the migration path, network configurations, and storage connections without risking disruption to actual business-critical VMs, thus resolving the contradiction between reliability and complexity.
2Reliability
If comprehensive prechecks are performed to uncover all issues, then migration reliability improves, but the complexity and time required for prechecks increases
Solution Approach 1:
The patent performs a partial precheck by instantiating only a dummy VM with minimal configurations necessary to validate the migration path, rather than performing exhaustive checks on all possible parameters. This dry-run migration tests the critical path (network connectivity, storage access, configuration compatibility) without requiring complete validation of every possible scenario, thus improving reliability while limiting time investment.
Solution Approach 2:
The precheck process is segmented into distinct phases: dummy VM instantiation, dry-run migration execution, and result validation. This segmentation allows the system to focus on critical validation steps without being bogged down by comprehensive checking of all parameters, reducing precheck duration while maintaining sufficient reliability.
3Reliability
If a dummy VM with matching configurations is instantiated and migrated to validate compatibility, then migration reliability improves, but device complexity and resource consumption increase
Solution Approach 1:
The patent creates a copy (dummy VM) with configurations matching the target VM to validate migration compatibility. This copy is instantiated with the same network settings, storage configurations, and hardware parameters, allowing the system to test the migration path without affecting the actual VM. The dummy VM serves as a safe test duplicate that validates configuration compatibility.
Solution Approach 2:
The dummy VM is designed as a temporary, disposable test object that is instantiated only for the precheck phase and then destroyed after validation. This short-lived test object incurs minimal resource consumption compared to migrating actual production VMs, as it exists only temporarily to validate configurations and is discarded afterward, reducing the impact of increased system complexity.
Data Source
AI summary
A method of migrating an executing virtual machine (VM) from a source host computer to a destination host computer, includes the steps of: issuing a first instruction to the source host computer to instantiate a dummy VM having a plurality of network configurations that match a corresponding plurality of network configurations of a target VM; issuing second instructions to the source and destination host computers to migrate the dummy VM from the source host computer to the destination host computer; determining that the dummy VM that has been migrated to the destination host computer is able to communicate with the target VM; and in response to determining that the migrated dummy VM is able to communicate with the target VM, issuing third instructions to the source and destination host computers to migrate the target VM from the source host computer to the destination host computer.