Live Virtual Machine Migration Techniques in Cloud Computing: A Survey

Abstract

Cloud computing is a service where storage and computing resources accessed on subscription basis. Cloud computing is powered by virtualization technology .Live migration is the process of moving a running virtual machine or an application between different physical machines without disconnecting the client , memory, network connectivity and storage of the virtual machine are transferred from the original host machine to the destination. This capability is being increasingly utilized in today's enterprise environments to provide efficient online system maintenance, reconfiguration, load balancing and fault tolerance. This paper presents a detailed survey on Live Migration of Virtual machines (VM) in cloud computing.

Dynamic Routing and Bandwidth Assignment for live Virtual Machines migrations

“…Traditionally, during the migration process, the VM is paused at the source server and is resumed on the destination host only when all data has been migrated and the VM has been reconfigured into the new server. The time period during which the VM is paused is known as downtime [2]. The downtime duration depends on the amount of data to be transferred (i.e., the VM size), the bandwidth provisioned for the migration request, the reconfiguration time (i.e., time needed to set-up the VM in the destination server) and the migration technique, i.e., offline or online (live) [17].…”

“…In this case, the VM can be accessed only after the whole migration is accomplished, thus a high service outage is introduced [2]. Given a VM with V M bits to be transferred (including all disk, memory and processors states), if migration is performed using B bit/s of bandwidth, the VM migration duration will be approximately T mig = V M /B, and this will roughly coincide with service downtime in the offline migration strategy.…”

“…Each VM typically supports a given cloud service, and it has been shown that migrating VMs across different DCs can be beneficial from several points of view, e.g., for redundancy purposes, to improve users quality of experience and to save energy by promoting active server consolidation [2].…”

“…We assume that D is constant for the entire duration of a VM migration 2. Note that, for both offline and online migrations, curves inFig.…”

A Development of Adaptive VM Migration Techniques in Cloud Computing

“…클라우드 컴퓨팅은 가상화(virtualization)를 기본으로 하 고 있으며, 특히 하이퍼바이저(hypervisor)라는 서버 가상화 기술이 많이 사용되고 있다 [1]. 가상화는 물리적인 한 개의 자원을 논리적으로 분할하여 효율적으로 나눠 사용하거나, 물리적으로 다른 수 개의 자원을 논리적으로 통합하여 사용 하는 기술로서 실제 사용자들이 물리적인 자원들을 논리적 으로 다양하게 제어할 수 있게 해주는 기술이다 [2].…”