Mostly the benefits of virtualization are discussed, however this articles tells when NOT to convert your system on virtualization.
Vice President of mobile security at Trend Micro, Cesare Garlati agrees to the fact that there are some situations when shifting to virtualization is not appropriate for a system. In recently held RSA Conference 2012 in London, he gave top most reasons of not converting the servers onto virtualization in accordance with need and situation.
Firstly he said that if you server is perfectly friendly with you and is working the way you want, and then there is no point of introducing complexity by turning the system into server virtualization.
Then there are the legal issues. Not all the applications are licensed to run in virtual servers. You should better not engage yourself in anything that disobeys the licenses your organization settled to. So you simply cannot shift to server virtualization in such cases.
Some apps with high I/O properties for example database, distributed SMP applications or grid that have basic requirements of high speed interconnects, intensive graphics applications or some other apps that have need of hardware cards, with such applications, do not even think of virtualization.
Virtual machines have their own time clocks. This clearly means that their time will deviate from the server host clock. If these small time deviations are critical for the applications you are using, then better keep using the physical systems.
Server virtualization definitely saves money. But the proper system installation and other apps do require money. So if you do not have enough budgets, the better not go for virtualization.
Many developments have been made in the field of virtualization. But still VM that runs on the top of Hypervisor cannot perform as quickly as the physical machine which runs on that very operating system. Yes you can add servers to run the Hypervisor, however shifting to virtualization is done to cut short the number of servers rather keep on adding the servers.
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