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Typical large datacenter is a mess. For many servers IT management often has no clue what particular server is doing, why it is needed, and who is responsible for the application installed. Often there are multiple "ghost servers" -- servers that are just circulating air, but which does not perform any useful function. Presence of multiple contactors often create "hijacked" server situation, when the real control of the server is out of the hands of IT. All those CMDB efforts often degenerate into red tape and has little connection to reality on the datacenter floor.
There are several broad classes of problems with IT infrastructure. Among them:
End users are experiencing slow response time and whether slow performance is due to the client, the server, or the network. You can also use these tools to detect problems in real time and fix them
Has increased demand caused a shortage of resources on your server? Are customers complaining about slow response times? In these days of exponential network growth, keeping up with demand can be a difficult challenge.
It's a phone call most administrators never want to receive. "The server is slow, no one can check email. Web pages are loading slowly, or not at all!" Too often administrators find themselves trying to climb up the steep slope of increased demand. As a user base grows, the demand placed on the server grows as well. This growth may be linear and predictable, or it may be completely random or exponential.
There are ways to avoid the angry phone call altogether. Understanding system bottlenecks and gathering statistical data can help you project your system's current and future needs. This can eliminate user complaints -- and prevent that phone from ringing.
Why does a system slow down in the first place? Slowdowns can usually be attributed to one or more bottlenecks, which are caused when part of the system is not running fast enough to keep up with the demands placed on it. The most common bottlenecks occur for the following reasons:
So how can you tell which of these systems may be having a problem? By using
the various tools of the capacity planning trade:
reports inform you when key resources are about to fail (that is, conditions are deteriorating) so that you can proactively troubleshoot problems before they seriously affect users.
What-If Capacity Trend report is an interactive Web-based tool, enables you to evaluate the current trends in resource usage and planning for growth and changes before problems occur.
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