Faisal Piliang Posted 22 Mar 2023 23:57
  
In the initial stage of migration, the source host starts an identical virtual machine on the destination host through the negotiation mechanism and puts it into a quiesced state.
After the source host QEMU records all the memory data of the virtual machine, it is transmitted to the destination host through the network. However, since the running business will read and write memory data during the transmission process, the newly generated memory data will be re-recorded after the first round of transmission is completed. It will transmit it to the destination host in the same way, and iterate in turn until the last recorded memory data meets a threshold, the source host will stop running- that is, only 1 second of service interruption duration.
QEMU transfers the remaining memory data to the destination host at one time, then the destination host starts running, and the source host shuts down.

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