A live storage migration mechanism over wan and its performance evaluation

Virtualization Technologies in Distributed Computing Pub Date : 2009-06-15 DOI:10.1145/1555336.1555348

Takahiro Hirofuchi, H. Nakada, Hirotaka Ogawa, S. Itoh, S. Sekiguchi

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引用次数: 54

Abstract

Live migration of virtual machines is a key technology for the next generation of IaaS cloud services, contributing to dynamic portability and mobility of VM-based services among datacenters. The practical use of live migration, however, is still limited inside a single datacenter. In WAN environments, network latencies cause inevitable I/O performance degradation of remotely-shared storage between source and destination sites; which is required to continue disk access of VMs before/after live migration. In our previous work, we proposed a transparent, relocatable I/O mechanism for VM migration, which enables VM disk images to be completely migrated to remote nodes without any modification of virtual machine monitors. In this paper, we present detailed performance evaluation of the proposed system, emulating a realistic WAN environment between remote datacenters. Experiments showed the proposed system achieved feasible I/O performance for various workloads including I/O intensive applications. Its background copy mechanism efficiently prefetches not-yet-cached blocks by exploiting the available bandwidth of WAN, thereby minimizing temporary performance degradation of the migrating VM system.

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一种广域网上的实时存储迁移机制及其性能评价

虚拟机的实时迁移是下一代IaaS云服务的一项关键技术，有助于在数据中心之间实现基于vm的服务的动态可移植性和移动性。然而，实时迁移的实际应用仍然局限于单个数据中心。在广域网环境中，网络延迟不可避免地会导致源站点和目标站点之间远程共享存储的I/O性能下降;用于在热迁移前后继续对虚拟机的磁盘访问。在我们之前的工作中，我们提出了一种透明的、可重新定位的VM迁移I/O机制，该机制使VM磁盘映像能够完全迁移到远程节点，而无需修改虚拟机监视器。在本文中，我们对所提出的系统进行了详细的性能评估，模拟了远程数据中心之间的现实WAN环境。实验结果表明，该系统在包括I/O密集型应用在内的各种工作负载下都具有可行的I/O性能。它的后台复制机制通过利用WAN的可用带宽，有效地预取尚未缓存的块，从而最大限度地减少迁移VM系统的临时性能下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Virtualization Technologies in Distributed Computing

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