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What are some of the most common mistakes people make when deploying a virtualization system?
What are some of the most common mistakes that you have seen businesses make when implementing virtualization?
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4 Answers
Among the most common mistake that is made when deploying virtualization is not properly understanding all the component parts of the environment. Being skilled in servers alone, or operating systems alone, or networking alone, or storage alone, is not enough. You have to have knowledge that is broad and deep, or at the very least, access to subject matter experts in the areas where your knowledge is weaker.
Other mistakes include:
-- Not setting aside sufficient time to plan out the infrastructure
-- Putting lots of virtualization traffic on the existing network, and being puzzled by network bottlenecks
-- Not understanding the security implications of putting servers into the same host.
-- Not identifying the I/O needs of different workloads before virtualizing the physical servers.
-- Not preparing for physical redundancy of the host server.
-- Failure to capacity plan, resulting in lots of pain for lots of VMs.
These are the more common issues...
Some of the most common mistakes that I have seen involve hardware. Whether it be inadequate network cards, or older processors, many people will scratch their heads looking at software configurations when it's something as simple as getting a better nic or adding more RAM.
Another mistake occurs when users keep default settings. They rob themselves of performance and security.
I think some common mistakes have been the lack of planning out a reliable redundant environment for optimizing uptime and DR Planning. Moving to a Virtual Environment is much more efficient and cost effective, But it's important to have a solid infrastructure that includes clustering and/or other High Availability solutions.
I had one customer that wanted to virtualise his server. He created 30 environments, so when he wanted to run one of his critical data application, he said the whole thing collapsed. His question to me was... How did that happen?
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