OnApp won't let me delete a Data Store. How can I remove it?
All versions of OnApp
Generally this is caused because there are still Disks existing on this Data Store within OnApp.
If you are sure you want to remove this data store, please first destroy all disks associated with it.
You can find these disks in Settings -> Data Stores menu, and then selecting the Data Store you would like to remove and removing any and all disks there.