If you have follow my guide to install the Dell Openmanage on a ESXi 4.1 host, and try the same thing on a ESXi 5.1 you will get a warning from the host saying:
This operation is NOT supported on 5.1.0 platform.
You need to install it directly on the ESXi host in 5.1 version.
So you just need to upload the Dell OM-SrvAdmin-Dell-Web-7.2.0-6945.VIB-ESX51i.zip file to the host, i will do this with WinSCP, i will put in the /tmp directory.
Then SSH to the host and run this commands:
esxcli software vib install –d /tmp/OM-SrvAdmin-Dell-Web-7.2.0-6945.VIB-ESX51i.zip
~ # esxcli software vib install -d /tmp/OM-SrvAdmin-Dell-Web-7.2.0-6945.VIB-ESX51i.zip
Message: The update completed successfully, but the system needs to be rebooted for the changes to be effective.
Reboot Required: true
VIBs Installed: Dell_bootbank_OpenManage_7.2-0000
After you have install the VIB packages successfully, the ESXi 5.1 host needs to be restarted. When the host is ready again, you should be able to see that UserVars.CIMvmw_OpenManageProviderEnabled is set to 1. In this location
Select the host and go to the Configuration tab. Click on Advanced Settings and find the UserVars.CIMvmw_OpenManageProviderEnabled, and check that this is set to 1. In ESXi 4.1, this is UserVars.CIMoemProviderEnabled