To identify DELL service tag on this server, you should login to vSphere client -> click on the top level node in the left-hand tree structure (this is the vmware node) -> click on the “Configuration” tab -> On the left side, it will display “Hardware” and “Software” sections -> click on “Processors” link in the “Hardware” section -> under the “System”, you’ll see the DELL service tag as shown in the picture below.