Dimensions of Virtualization
- 2014-01-10
- By admin
- Posted in Vmware Training
I know you are surly aware about what virtualization is all about . But have you come across the term called dimension of virtualization ? let me explain ,
First Dimension
The first dimension virtualization is running a single VM on top of a physical Server with the help of a hypervisor .
But why on earth you need such a virtual environment ? Why can’t you run the OS directly on top of your physical hardware which will be easier for the hardware as well as software ?
Consider the case of running a legacy windows 2000 or even windows NT 4.0 on a new generation server ? your SAS disk controllers will had a hard time figuring out what the product is all about . So you are supposed to continue using that bulky pedestal server for your your legacy application support . Not anymore , you can use your ESXi server to perform a First dimension virtualization so that it will have a one to one correspondence between the guest OS and the Physical hardware . And the hyper-visor layer will iron out the differences in hardware and provide a working environment for the Windows 2000.
Second Dimension
When someone plans for virtualization , their basic goal will be server consolidation , that is putting more servers on a single physical machine to save power , CPU cycles and management hassles . So the second Dimension virtualization means multiple virtual machines runs on a single server on top of a hypervisor layer .
Sure enough it will ne more complicated than the first dimension virtualization because the processor , memory , network and disk are shared among the virtual machines and the Virtual Machine Monitor has to deal will all this .
Third Dimension
The Third dimension is running multiple VM’s on a DRS ( distributed resource scheduler ) cluster . ie the ESXi hosts are grouped together to a cluster which will support automatic vMotion of the VM’s for load balancing . So ulike a second dimenation virtualization where all the vm’s will make a single ESXi run for its resources the Third dimension offer a better place and quality of living for a VM and its guest OS
I know these are not a big deal for a virtualization professional . But this post is just for introducing the concept of dimension of virtualization to persons who have not heard about it
Is it For You ?
If you have to get comfortable on the vmware training session , make sure you are already comfortable with the normal networking concepts. A good understanding of TCP/IP networking and Microsoft family of networking OS makes you an ideal candidate. Your skills with command prompt environments in general and linux commands in particular will be nice
The more practical skills you have in IT infrastructure management , the better. Hope you are already aware of the basic hardware aspects, memory management concepts , network cabling , and the basic routing skills. the more you know about the switching environments and terms , the better.