Live VM migration help attain both cloud-wide load balancing and operational consolidation while the migrating VMs remain accessible toward users. To avoid period of high-load for the complicated resources, IaaS-cloud operators assign specific time windows for such migrations to occur in an orderly manner. Moreover, provider normally relies on share-nothing architectures to get scalability. In this paper, we focus on the immediate scheduling of live VM migrations in large share-nothing IaaS clouds, such that migration are complete on time and without adversely affecting agreed-upon SLAs. We offer a scalable, distributed network of brokers that oversees the progress of all on-going migration operations within the context of a provider. Brokers make use of an fundamental exceptional purpose file system, termedMigrateFS, that is capable of both replicating and keeping in sync virtual disks while the hypervisor live-migrates VMs (i.e., RAM and CPU state). By restrictive the resources consumed during migration, brokers implement policies to reduce SLA violations while seeking to complete all migration tasks on time.

Distributed Systems, Cloud Computing, IaaS Clouds, Virtual Machine Migration

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