In the last couple of weeks I had a lot of e-mail conversations with Keith Erekson, who suggested to add a new hardware check type for IBM servers in the Nagios plugin check_esxi_hardware. After a lot of research concerning the CIM providers and their response codes we finally can say, that the DELL outputs seem to work for IBM servers as well.
This was tested on an IBM x3550 server with ESXi 4.1 and ESXi 4.1 U1. The removed disks and power supply were successfully detected and the plugin notified with a CRITICAL status.
Thanks a lot to Keith for his patience and his tests!