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Live migration of virtual machines is now commonplace but the issue of synchronising storage remains an obstacle to wide-area migration between datacentres. The authors discuss the range of possible designs for synchronising disk images and argue that they have to be adaptive at the sector level to efficiently transfer disk-state to the destination. They show, using a number of production workloads, that delaying the transmission of "Hot" sectors can achieve considerable bandwidth reduction over a naive eager strategy.
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