In the paper, we first analyse the live migration of Kernel based Virtual Machine (KVM), and then implement a Linux virtual disk driver called DM (Disk Migration). During the live migration, KVM will make use of the DM module to migrate the hard disk, so KVM live migration is feasible when there is no shared disk between the source and the destination. The DM module uses "bitmap" algorithm to record disk changes, and uses "request-reply" algorithm to safely migrate the dirty disk blocks, and deploys "precopy" algorithm to reduce the downtime of KVM live migration. The experiments show that the downtime of live migration is less than 100ms, which means these algorithms the DM uses can effectively limit the interrupt time of service.
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