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Virtualization using VMware technology
Performance Implications for Memory (RAM)
Virtualization does not decrease the amount of RAM required to run an application and its host operating system, and like any software, the virtualization layer requires its own portion of RAM. As such, memory is often a limiting factor in determining the total number of virtual machines that you can consolidate on to a single physical server.
VMware technology adds very little memory overhead offering advanced memory management mechanisms such as RAM over-commitment and transparent page sharing that automatically expand or contract the amount of RAM allocated each virtual machine as application loads increase and decrease. This capability lets you achieve a higher level of server consolidation than is possible with traditional static virtual memory.
The nice thing about VMWARE or Virtual machines is the fact you can increase at anytime the memory or storage required to run applications. No need to re-install buy new licenses, extra. just move the VMWARE machine image VXD to another host, start it again, change Internet DNS, bring down the machine at the ram and bring it back up, I bet no one would have noticed it.
Performance Implications for Networking
Networking sizing and performance considerations in a virtual infrastructure are very similar to networking considerations in physical IT environments. In most cases, network throughput of virtualized workloads is comparable to the network throughput of the physical workloads.
VMware offers an ideal platform for secure, high-speed networking between virtual machines on a single physical server, supporting network topologies that normally depend on the use of additional hardware to provide security and isolation. You can also network virtual machines across physical servers with transparency and high throughput, as each virtual machine gets its own IP address and can utilize up to four virtual network interface cards (NICs).
Virtualization using VMware technology
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