Memory spikes and Reservation

Here is the host configuration

One of the users complains about memory spikes messages that they are getting from the system.

Available Ram is 170988.0 KB for xxxxxxxx . Please take appropriate action.

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I ran spotlight (My Fav. freeware tool from Quest Control) on those machine and found the spikes (Check spike before 11.35AM)

I went to the VC and selected the VM’s properties and set the memory reservation to and the memory utilization on virtual machine changed (Check the graph pattern after 11.35AM).