Following your suggestion I've increased cores from 4 to 8 and RAM from 12GB to 24GB, same issue. What about the 60s timeout ? The interface "ignores" the 180s I configure for storage discovery timeout.
Following my previous answer, after more time troubleshooting the issue it seems that the plug-in is totally discarding the spanned disks exclusions, I mean that in the end jobs fail because of resources that are not ONTAP (SANtricity in my case) even if I exclude them from the spanned disks. So to be clear, if I have in my datastore a VM which has a disk on ONTAP and a disk on a foreign storage (not ONTAP), the whole job will fail, even if I select "Always exclude all spanning datastores". Please help !