We have run into a similar situation whereby two devices (Windows server and EMC SMI-S Provider) must be added into Zenoss but they have the same IP address. We need the ability to monitor the Windows server as a Windows server and monitor EMC storage via the SMI-S Provider running on the same Windows server.
I researched the commercial ZenPacks as Jane suggested and found that the VMware vSphere ZenPack allows one to add the same vSphere Endpoint multiple times with the same IP but under different device IDs. Unfortunately, this won't work for our scenario. We are proceeding down the path of assigning another IP address to the same Windows server. The new IP will be used for the EMC monitoring while the other will be used for everything else. We will not be placing the new IP address into DNS.
Best Regards,
ds