You can remove LV from the GUI. If you go to Configuration->Volume Manager->[VG name] then click on the red "X" next to the volume. If this is inactive, you can delete the LV from system console "CTRL+ALT+X" "Delete LV". From the same menue, you can 'delete content of unit" which will delte the VG.
Then, from the system GUI do a rescan, and then you should see your Array "Unit".
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