def get_physical_drives(self):
        physical_drives = []
        for controller in self.controllers:
            # First add unassigned physical drives.
            for physical_drive in controller.unassigned_physical_drives:
                physical_drives.append(physical_drive)
            # Now add physical drives part of RAID arrays.
            for array in controller.raid_arrays:
                for physical_drive in array.physical_drives:
                    physical_drives.append(physical_drive)

        return physical_drives
Get all the RAID physical drives on the Server.
dataset/ETHPy150Open openstack/proliantutils/proliantutils/hpssa/objects.py/Server.get_physical_drives