The following procedure will help unmount a VMFS volume and detach its corresponding LUN device:
- Log in to the vCenter Server using the vSphere web client and use the key combination Ctrl + Alt + 4 to switch to the storage view.
- Right-click on the desired datastore and click Unmount Datastore...:
- On the Unmount Datastore... window, select all the ESXi hosts to unmount the datastores from, and click OK:
- The Recent Tasks pane should list an Unmount Datastore task complete successfully for each of the ESXi hosts. And the VMFS ...