Before you run the Foglight® Management Server in a virtual image, you must make sure that the planned number of processors will be made available. In certain scenarios, the virtual image will not exist exactly as planned.
For example: A number of virtual machines are pinned to a single CPU and 600 seconds of CPU time are available. Four of the virtual machines have load and about 300 seconds of ready time has accumulated, so you can expect a slowdown of approximately 50 percent. An event with a response time of 1 second could be expected to take 1.5 seconds under that level of load as a direct result of the delays caused by the ready time. This is not atypical for observations of multiuser systems under load. The same factors apply to an ESX® Server host running multiple virtual machines. Also, the more virtual CPUs the VM has, the more CPUs have to be free, or the VM may have to wait longer for x number of CPUs to be free.
Before you run the Foglight® Management Server in a virtual image, make sure that the image is configured with the necessary amount of memory.
Review the MaxMemory, TotalMemory, and FreeMemory entries. For more information about the diagnostic snapshot, see Diagnostic Snapshot .
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