V mbuddies coordinating live migration of multi tier applications in cloud environments
- 1. VMbuddies: Coordinating Live Migration of Multi-Tier Applications in Cloud Environments Abstract: Enabled by virtualization technologies, various multi-tier applications (such as Web applications) are hosted by virtual machines (VMs) in cloud data centers. Live migration of multi-tier applications across geographically distributed data centers is important for load management, power saving, routine server maintenance and quality-of-service. Different from a single-VM migration, VMs in a multi-tier application are closely correlated, which results in a correlated VM migrations problem. Current live migration algorithms for single-VM cause significant application performance degradation because intermediate data exchange between different VMs suffers relatively low bandwidth and high latency across distributed data centers. In this paper, we design and implement a coordination system called VMbuddies for correlated VM migrations in the cloud. Particularly, we propose an adaptive network bandwidth allocation algorithm to minimize the migration cost in terms of migration completion time, network traffic and migration downtime. Experiments using a public
- 2. benchmark show that VMbuddies significantly reduces the performance degradation and migration cost of multi-tier applications. Existing System: We call this problem correlated VM migrations. Correlated VM migration scan cause significant performance penalty to multi-tier applications. Consider the following scenario: if the middle tier is first migrated, then the other two tiers must redirect the communication and data access traffic to another data center and wait for the processing results to be sent back. Moreover, because the multi-tier application and migration processes share the same link for data transferring, given the data-intensive nature of multi-tier applications and limited network bandwidth between two data centers, network and width contention may cause significant performance degradation for both applications and VM migrations. Proposed System: The aforementioned challenges, we propose a coordination system called VM buddies to solve the correlated VM migrations problem form ultitier applications. VM buddies embraces a synchronization protocol to ensure that all VMs complete their migrations simultaneously, avoiding intermediate data exchange across distributed data centers. In order to reduce the migration cost, we develop network bandwidth allocation algorithms according to memory access patterns of different workloads. For VMs with stable memory access pattern, we propose an analytical cost
- 3. model of pre-copying algorithm that is widely used for live VM migrations in common virtualization platforms such as VMware, Xen, KVM and Hyper-V. Hardware Requirements: • System : Pentium IV 2.4 GHz. • Hard Disk : 40 GB. • Floppy Drive : 1.44 Mb. • Monitor : 15 VGA Colour. • Mouse : Logitech. • RAM : 256 Mb. Software Requirements: • Operating system : - Windows XP. • Front End : - JSP • Back End : - SQL Server Software Requirements: • Operating system : - Windows XP. • Front End : - .Net • Back End : - SQL Server