def get_dev(address, port, iqn, lun):
    dev = ("/dev/disk/by-path/ip-%s:%s-iscsi-%s-lun-%s"
           % (address, port, iqn, lun))
    return dev
given the method, return a set of aligned sequences
dataset/ETHPy150Open openstack/ironic/ironic/drivers/modules/deploy_utils.py/get_dev--crossover with--dataset/ETHPy150Open CGATOxford/cgat/scripts/fasta2distances.py/FilterAlignedPairForPositions