System And Method Of Optimizing Vm Disk Data Transfer Time For Cold Migration By Preloading Page Cache

Abstract: ABSTRACT System and method of optimizing VM disk data transfer time for cold migration by preloading page-cache A fast copy method and systems is provided for virtual machine migration. Data from the source virtual machine’s (VM) root disk is read into source server's system memory, thereby populating the data of VM1's root disk into the host's server’s page cache. Data from the destination VM's root disk is read into destination server's system memory, thereby populating the data of VM2's root disk into the host's page cache. A file descriptor used to read the root disk of source VM (VM1) and destination VM (VM2) on both source and destination servers are kept open even after the reads are complete, so that the page cache entries are not evicted by the source and destination servers. This technique enables the subsequent copy of the VM1's root disk to the destination server to utilize the page cache on both source and destination servers, instead of reading and writing to the source and destination VM's root disks respectively, thereby significantly reducing the time for root disk content transfer during cold migration. This allows cold migration to speed up significantly.

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