R610 H700 Single Disk RAID0 Failure

Had a single drive that I added to the server I had in a colocation datacenter for non-sensitive storage.  Had to be in a RAID-0.

Then, a few months later, that drive failed.  The datacenter is not close, and it wasn't critical, so I waited until I needed to go out for another reason.  On that trip, I physically replaced the failed drive, as well as added another drive.  Then I left.

Later, I remotely connected but when I tried to get into the virtual disk wizard in open manage, it tells me that "The create virtual disk wizard failed to launch. A new virtual disk cannot be created while preserved cache exists. If the failed array can be made healthy, preserved cache can be flushed. If not, discard preserved cache under controller actions and create a new virtual disk."

But when i go to discard preserved cache, I get a message warning me that it will erase all data.  This is a production hyper-v server, and while the VMs are backed up, I really don't want to take it down and have to rebuild it just to swap out a bad drive.

Do I need to go back and remove the replacement disk first?  Assign it to a global spare?  Where do I go from here to fix this?