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Take a good hard look at your current server environment Identify and consolidate processing-compatible applications to a single server, or you can virtualize your existing multiserver datacenter to share processing capabilities from a common pool Identify your mission-critical servers Those might be good candidates to be left in place in a one-to-one relationship Those are the servers that house SAP, PeopleSoft, and Siebel But then consolidate the non-heavy-hitting applications (like file and print, Exchange, and so on) and virtualize the remaining servers to construct a common pool of hardware resources
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Some servers are ideal for virtualization, while others should remain on their own machines Best not to virtualize mission-critical, heavy-hitting servers: Best to virtualize non-heavy-hitting servers:
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Then, configure the aforementioned consolidated servers so that their CPU, memory, and adapters can be shared with the heavy-hitting servers when needed Most servers today hover around 10 to 15 percent utilization When you are done with virtualization, the average CPU utilization is about 80 percent
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Over the past 30 years or so we ve gotten into the habit of buying more servers when we get new applications That may have been the solution 25 years ago, but it isn t today It s more than likely that you are not even tapping the resources of the equipment you have, so stop buying new stuff Tap into your existing hardware pool and reduce the number of servers you think you need, simply to increase on-demand processing capacity If you virtualize the servers you have, you can save money (by not buying new equipment) and get the most out of the resources you already have
You needn t buy new equipment You can repurpose existing servers to perform your virtualization functions
Old server
Now houses four virtualized servers
Part III:
Cloud Computing at Work
Virtualizing your servers enables them to identify their own CPU, memory, and adapter requirements They will be able to seek out resources on neighboring servers when more capacity is needed, and then surrender those resources when the demand has lessened
Concerns
Sure, we ve clapped virtualization s back and described how it can be helpful, but there are times when it is not ideal For instance, graphics-intensive applications are not well suited for today s virtual environment Video cards cannot handle the requirements of a highperformance graphics adapter Gaming, CAD, and software requiring three-dimensional graphics are not ideal for a virtualized environment Databases and business intelligence software are also poor matches for virtualization, simply because they require a lot more memory and processor power than current virtualized servers can provide Databases can be successful, if small enough, but they will scale poorly Further, server applications that require access to hardware like PCI cards and USB devices are difficult to virtualize Also server virtualization doesn t typically play well with proprietary hardware, so applications that need the use of more than the Ethernet jack are not typically going to work
NOTE These are issues now, but expect virtualization software companies to figure it out in the
near future
Security
When it comes to security, the same risks that exist for a physical server exist for a virtualized server There is a misconception that virtual servers are somehow immune to these problems or that the host server acts as sort of a bodyguard, but that s not the case Virtual machines need to have the same networking concerns dealt with and the same virus concerns addressed as a physical machine You also need to protect against spyware and malware When configuring your servers, let your host server do just its job don t add any extra applications that it doesn t need It will be safer and perform its duties better when it just has one thing to do In fact, security is extra important on a virtualized server, because a virtualized host can potentially lead to the failure of other virtualized machines on the same physical server It s ideal to separate the virtualization host and virtualized machines and be extra cautious when setting up perimeter security to further protect host servers It s also ideal to have strong, highly guarded passwords and run with the smallest number of privileges
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