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best practice for setting virtual server memory and cpu alarms in vsphere

im using vsphere 5.0
I want to setup alarms to alert me when virtual servers are suffering from high memory and cpu usage
so that I can know when to add memory or add extra cpu
am I right in thinking that when a virtual server cpu is running around 80% this is fine so I should set my alarms to trigger if say memory and cpu is at 99% for 1 min or more
the cpu metrics and memory metrics inside vsphere can be quite confusing
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dougdog
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dougdog
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Practice with the Default Alarms, offered, and if too low, increase the values.

I would change the alerting period, to longer than a 1 min, sometimes you will get spikes at 100% e.g. patching, that may last longer than a 1 min.

I would use values of 5 minutes, but it's important, that you use values right for your environment.

see my EE Article

HOW TO:  Performance Monitor vSphere 4.x or 5.0
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dougdogAuthor Commented:
if cpu demand is more than cpu usage should I increase cpu
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
difficult to answer, you really need a good baseline of performance of the machine.

an easy guide and tool is

http://www.veeam.com/esxi-monitoring-free.html.
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