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Robert Bradford, Evangelos Kotsovinos, Anja Feldmann, Harald Schiöberg - page 10 / 24

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Implementation - Intercepting

The blkfront device driver communicates with the dedicated storage VM via ring buffer.

The blktap framework intercepts requests, but does it in user space.

Once a disk request makes it to the backend, it is both committed to the disk and sent to the migration client.

The client then packages the write up as a delta.

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