Virtual Machine Slot Reuse for High Availability Migration
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Solution Overview
Problem
In cloud computing environments, migrating applications with high availability requirements is resource-intensive and inefficient, as it often necessitates doubling the resources needed for both the application's operation and the migration process, leading to suboptimal resource utilization.
Innovation Solution
The implementation of an application upgrader that identifies reserved slots for failover and uses them for migration-based upgrades, allowing the application to switch roles between source and target virtual machines without requiring additional resources, thereby reducing the resource footprint during the upgrade process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional migration methods are used to migrate high availability applications, then the application can be moved between virtual machines, but additional CPU and memory resources are required, leading to increased resource consumption
Solution Approach 1:
The virtual machine slot serves multiple functions: it can be used for running production workloads during normal operation and for receiving migrated workloads during failover events. The same physical hardware resources are dynamically allocated between different virtual machines based on operational needs, eliminating the requirement for dedicated backup resources.
Solution Approach 2:
The system dynamically adjusts resource allocation between the source virtual machine and target virtual machine based on the operational state. During normal operation, the slot is assigned to production workloads. During migration or failover, the slot is dynamically reassigned to receive the migrated workload, with resources being reallocated in real-time without requiring permanent additional capacity.
2Reliability
If reserved slots are allocated for failover purposes, then high availability is maintained, but resource utilization efficiency decreases due to idle reserved capacity
Solution Approach 1:
The system performs preliminary identification of suitable target virtual machines and their slots before actual failover occurs. By pre-assessing resource availability, compatibility, and capacity in the slot pool, the system ensures that when failover is needed, resources are already identified and ready, eliminating the need for permanent reserved slots while maintaining rapid failover capability.
Solution Approach 2:
The virtualization management system automatically manages the slot allocation and resource distribution without requiring manual intervention or pre-configured reserved capacity. The system self-adjusts by identifying available slots in the pool, allocating them for migration purposes, and then reallocating them back to production use after successful migration, thereby serving its own resource management needs efficiently.
Data Source
AI summary
Methods, apparatus, systems, and articles of manufacture are disclosed for high availability (HA) application migration in a virtualized environment. An example apparatus includes at least one memory, instructions in the apparatus, and processor circuitry to at least one of execute or instantiate the instructions to identify an HA slot in a virtual server rack, the HA slot to facilitate a failover of an application executing on a first virtual machine (VM) in the virtual server rack, the first VM identified as a protected VM, deploy a second VM in the HA slot, transfer data from the first VM to the second VM, and, in response to not identifying a failure of at least one of the first or second VMs during the transfer, trigger a shutdown of the first VM, and synchronize migration data associated with the virtual server rack to identify the second VM as the protected VM.