关键词: 云计算, 虚拟化, 虚拟机, 动态迁移

Abstract: Since the iterative copy has an issue of copying the same memory page repeatedly in pre-copy live migration method, it will make the memory page increase and the total migration time extend respectively. This paper attempts to improve the strategy of copying the dirty pages. Specially, the frequently updated page is transported in the stage of stop-and-copy, which can decrease the total migration time effectively. However, this may extend the downtime because the pages generated in the stage of stop-and-copy increase. Therefore, it utilizes the LZO method to compress the pages in the stage of stop and then transport them, which can shorten the downtime by reducing the data volume. Applying the above method to virtual machine migration, experimental results show that the method shortens the total migration time clearly comparing with the pre-copy method, especially in the case of high-rate dirty pages.