I have upgraded our 6Tb unit to 11Tb since there was only 55Gb left. First by extending the RAID array and using pv resize afterwards.

The manager now shows the unit (volume group) having 11Tb however I cannot use the extra 5Tb of storage since the slider won't go past the 55Gb mark, it seems the newly added space is seen by the volume group but cannot be used. I already have rebooted the system. Any clues on how to solve this problem?