if (memoryDiff > 0) {
_resourceLimitMgr.incrementResourceCount(caller.getAccountId(), ResourceType.memory, new Long (memoryDiff));
}
// #1 Check existing host has capacity
if( !excludes.shouldAvoid(ApiDBUtils.findHostById(vmInstance.getHostId())) ){
existingHostHasCapacity = _capacityMgr.checkIfHostHasCpuCapability(vmInstance.getHostId(), newCpu, newSpeed)
&& _capacityMgr.checkIfHostHasCapacity(vmInstance.getHostId(), cpuDiff,
(memoryDiff) * 1024L * 1024L, false, _capacityMgr.getClusterOverProvisioningFactor(host.getClusterId(), Capacity.CAPACITY_TYPE_CPU),
_capacityMgr.getClusterOverProvisioningFactor(host.getClusterId(), Capacity.CAPACITY_TYPE_MEMORY), false);
excludes.addHost(vmInstance.getHostId());