Hi All, This issue is caused to high memory reservations set on few virtual machines. The memory is being reserved only for those machines even if it’s not being used; hence the new virtual machine does not have enough memory to power on. Hence the suggestion would be that the reservation for those virtual machines be reduced, so that some memory would be made available for the new virtual machine to power on. Please refer to the vSphere HA Guide available from the following URL on Page 20 for more information about the Admission Control Slot Calculation. http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-55-availability-guide.pdf
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