Live Migration Is The Process Of Moving A Running Virtual Machine Essay

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INTRODUCTION Live migration is the process of moving a running virtual machine or an application between different physical machines without disconnecting the client/application. Memory, storage and network connectivity of the virtual machine is transferred from the original to the destination host machine.
VM Memory migration
The Two techniques for moving the memory state of virtual machine from the source to destination are:- 1.pre-copy memory migration and 2.post-copy memory migration.
Pre-copy memory migration
Warm-up phase
The Hypervisor copies all the memory pages from source to destination while the VM is still running on the source. If some memory pages change or become 'dirty ' when the process is going on, they will be re-copied until the rate of re-copied pages is not less than page dirtying rate.
Stop-and-copy phase
After the warm-up phase, the VM will be stopped on the original host and the remaining dirty pages will be copied to the destination, and the VM will be resumed on the destination. The time between stopping the VM on the original host and resuming it on destination is called "down-time",which ranges from a few milliseconds to seconds according to the memory size and applications running on the VM.
Post-copy memory migration

Post-copy VM migration is done by suspending the VM at the source and a minimal subset of the execution state of the VM (CPU state, registers and non-pageable memory) is transferred to the target. . The project will make

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