To get the updated list of accessible Writable Volumes in your App Volumes deployment, you can rescan the datastore where the Writable Volumes VMDK files reside.
The rescan operation only checks for Writable Volumes that are already configured to this App Volumes Manager instance.
If new Writable Volumes are added to the datastore from a different App Volumes Manager or deployment, use the Import option so that the current App Volumes Manager detects them. See Import Writable Volumes for details.
If any of the Writable Volumes VMDK files are missing from the datastore or are corrupt, they appear as Detached under Writable Volumes in App Volumes Manager.