Modeling and Analysis of High Availability Techniques in a Virtualized System

Modeling and Analysis of High Availability Techniques in a Virtualized System
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虚拟化系统高可用性技术的建模与分析

DOI:
10.1093/comjnl/bxx049
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发表时间:
2017-05
期刊:
The Computer Journal
影响因子:
--
通讯作者:
Zhenjiang Zhang
Zhenjiang Zhang
中科院分区:
其他
文献类型:
--
作者:
Xiaolin Chang;Tianju Wang;Ricardo J. Rodríguez;Zhenjiang Zhang

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对虚拟系统的可用性评估对于云计算服务的广泛部署至关重要。基于时间、基于预测的虚拟机(VM)恢复和虚拟机监视器、VM故障转移和实时VM迁移是虚拟系统中常见的高可用性(HA)技术。本文研究了在可能发生各种软件和硬件故障的虚拟系统中,这些可用性技术的组合对VM可用性的影响。对于每种组合,我们构建分析模型恢复机制以提高VM可用性;(2)无论是否部署故障转移和/或实时VM迁移,当预测成功率高于70%时,基于预测的恢复机制比基于时间的VM恢复更能提高VM可用性;(3)故障转移机制优于实时VM迁移,尽管它们可以协同工作以获得更高的VM可用性。此外,它们还可以与软件恢复机制相结合,以实现更高的可用性;(4)时间间隔设置对于基于时间的恢复机制至关重要。这些分析结果为在虚拟系统中部署和设置HA技术提供了指导。
Availability evaluation of a virtualized system is critical to the wide deployment of cloud computing services. Time-based, prediction-based rejuvenation of virtual machines (VM) and virtual machine monitors, VM failover and live VM migration are common high-availability (HA) techniques in a virtualized system. This paper investigates the effect of combination of these availability techniques on VM availability in a virtualized system where various software and hardware failures may occur. For each combination, we construct analytic models rejuvenation mechanisms to improve VM availability; (2) prediction-based rejuvenation enhances VM availability much more than time-based VM rejuvenation when prediction successful probability is above 70%, regardless failover and/or live VM migration is also deployed; (3) failover mechanism outperforms live VM migration, although they can work together for higher availability of VM. In addition, they can combine with software rejuvenation mechanisms for even higher availability; (4) and time interval setting is critical to a time-based rejuvenation mechanism. These analytic results provide guidelines for deploying and parameter setting of HA techniques in a virtualized system.
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