In classification of server consolidation frameworks, existing server

In Cloud
Computing VMs emigrate over Cloud Data Centers. Cloud Data Center offers many
applications to manage resources for optimization. Virtualization uses VM
migration for replacing VMs over Cloud Data Centers to accomplish more
different resources for providing maintenance and load balancing. VM migration
techniques emigrate VMs through LAN or WAN links. But, VMs migrate across WAN
links uses server consolidation frameworks for stopping needless servers.VM
migration methods for server consolidation examined to derive critical
parameters and improve best techniques of VM emigration. This paper is
structured as follows. Section two Cloud Computing, VM migration, DVFS
technology, and server consolidation method. Section three shows a taxonomy for
the classification of server consolidation frameworks, existing server
consolidation frameworks, and comparisons of existing frameworks based on
parameters. Section four shows a thematic taxonomy on bandwidth optimization
schemes and DVFS-enabled power optimization then detailed discussion on
comparisons of existing schemes. Section five briefly discusses in the VM
migration area. Section six concludes the research




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This section discusses cloud computing, virtual machine migration,
server consolidation, and DVFS enabled VM mi-gration process



A. Cloud Computing


Cloud computing
help users and provide access to a range of data and software services to
manage their work. Cloud com-puting is a computing model that allows better
management higher utilization and reduced operating costs for datacenter
operators while providing on-demand resource provisioning for multiple
customers. Users rent virtual resources and pay for only what they use. The
amount of application programming running in computer and number of users
connected will create workload to the cloud.


B. Virtual Machine


Virtual machines in the cloud should emigrate from one machine to
another. Migration is related to Cicada. Cicada’s architecture inserts VM and
updating them. When VM place on servers the dataset should be there for all VM
through distinct storage like Amazon. Migrating a virtual machine needs the
migrating of both virtual memory and local data. Migration can be live but it
affects few seconds of down time to VM.


C. Consolidation Server


couldn’t run on the same operating systems. By arranging virtual server for
consolidating those applications on one physical server. Virtual server let
users to install many operating systems on the same server. You will run
already mismatched applications one by one, each one isolated from the others.
The consolidation of many distinct servers on many virtual machines which runs
on one physical server.


D. DVFS enabled VM
migration process


Today all
processors combine Dynamic Voltage and Fre-quency Scaling (DVFS) to CPU as
frequency at runtime. DVFS and Consolidation permits VMs to be migrated between
hosts. It depends on the CPU load over the different hosts and to switch
unwanted machines off. A consolidation system should put all the VMs on a
reduced set of machines which should have a high CPU load and DVFS might be
useless 1. The importantance of consolidation system is memory. All Virtual
Machines needs physical memory because limits the number of VMs that can run on
a host. So that, if consolidation can reduce the number of dynamic machines in
a hosting center,

but it couldn’t assurance all usage of CPU on active machines
while it is memory bound. The actual usage of DVFS gets the advantage of
reducing power consumption by lowering the processor frequency. However, most
of the computing infras-tructures depend on multi-core and high frequency