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Robert Bradford, Evangelos Kotsovinos, Anja Feldmann, Harald Schiöberg - page 11 / 24

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Implementation - Application

After the bulk transfer, and in parallel with the Xen transfer, the deltas are transferred and applied to the migrated VM by the migration daemon in the storage VM at the destination.

If the delta queue becomes empty and the Xen migration is finished, I/O requests are put on hold until the application of the current crop of deltas is finished.

The authors found that delta application was normally finished before Xen migration, adding zero time to the  overall migration.

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