you can check the CPU and Memeory status of a ESX HOST by using these methods.
Perform the following steps to create a CPU graph that shows data for a virtual machine from the last hour:
1. Connect to a vCenter Server instance with the vSphere Client.
2. Navigate to the Hosts And Clusters or VMs And Templates inventory view.
3. In the inventory tree, select a virtual machine and select the Performance tab from the content pane on the right, and then change the view to Advanced.
4. Click the Chart Options link and in the Customize Performance Chart dialog box, select CPU from the resource type list. Select the Custom interval.
5. Near the bottom of the Chart Options section, change the interval to Last 1 Hours.
6. Set the chart type to Line graph and select the virtual machine itself from the list of objects.
7. From the list of counters, select CPU Usage In MHz (Average) and CPU Ready. This shows you how much processor is actually being used and how long it's taking to schedule the VM on a physical processor and click OK to apply the chart settings.
Perform the following steps to create a real-time graph for a virtual machine's memory usage:
1. Use the vSphere client to connect to a vCenter Server instance and navigate to either the Hosts And Clusters or the VMs And Templates inventory view.
2. In the inventory tree, click a virtual machine. This shows you the Summary tab and click the Performance tab, and switch to the Advanced view.
3. Click the Chart Options link and in the Customize Performance Chart dialog box, select the Memory resource type and the Real-Time display interval.
4. Select Line Graph as the chart type and in the list of counters, select to show the Memory Usage (Average), Memory Overhead (Average), Memory Consumed (Average), and Memory Granted (Average) counters. This shows memory usage, including usage relative to the amount of memory configured for the virtual machine.
5. Click OK to apply the chart options and return to the Performance tab.
