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Advances, Systems and Applications

Journal of Cloud Computing Cover Image

Table 1 Comparison table of pre-copy and post-copy based on Performance metrics

From: A critical survey of live virtual machine migration techniques

Performance metrics Pre-copy technique Post-copy technique
Preparation time It includes all the modified pages in iterative memory copying phases Negligible
Downtime It includes transferring any remaining dirty pages It includes transferring another minimal execution state
Resume time Re-schedule the target VM at the destination server and remove the memory pages at the source server Majority of post-copy approach transfer the VM state and most of the memory pages in this period
Pages transferred Transfer number of pages during preparation time period Transfer number of pages during resume time period
Total migration time More Less
Performance degradation High due to the tracking of dirtied pages for write-intensive workloads High due to servicing of faulty pages