@property
    def maxLevel(self):
        l = 0
        for cell in self._cells:
            p = self._pointer(cell)
            l = max(l,p[-1])
        return l
``UnmountBlockDevice.run`` unmounts the filesystem / block device
dataset/ETHPy150Open simpeg/simpeg/SimPEG/Mesh/TreeMesh.py/TreeMesh.maxLevel--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/test/test_blockdevice.py/UnmountBlockDeviceTests.test_run