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The observed speeds for the warm migration single disk transfer and disk conversion are approximately the same as for the cold migration.
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The benefit of warm migration is that the transfer of the snapshot is happening in the background while the VM is powered on.
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The default snapshot time is taken every 60 minutes. If VMs change substantially, more data needs to be transferred than in cold migration when the VM is powered off.
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The cutover time, meanng the shutdown of the VM and last snapshot transfer, is dependent on how much the VM has changed since the last snapshot.