I have couple of datastores that are stuck in the Storage list that I can not remove. The unmount button is grayed out and the status if the device is inactive. I need to reconnect these devices, but I can not since the old has the same address.
The error message that I've got when the unmount button was available is:
Call "HostDatastoreSystem.RemoveDatastore" for object "datastoreSystem-254" on vCenter Server "vsphere.domain.name" failed.