Dell does have esxi5.1 image and it is recommended to use this image to resolve any driver issues that may be causing your issue. If it's an option try reinstalling with the vendor image to see if this clears it up.
-vFantastic
Dell does have esxi5.1 image and it is recommended to use this image to resolve any driver issues that may be causing your issue. If it's an option try reinstalling with the vendor image to see if this clears it up.
-vFantastic