def METHOD_NAME(controller_id, nsid, aux={}):
    """Returns qemu-arguments for a namespace configuration"""
    drive_id = f"{controller_id}n{nsid}"
    drive = {
        "id": drive_id,
        "file": str(nvme_img_root / f"{drive_id}.img"),
        "format": "raw",
        "if": "none",
        "discard": "on",
        "detect-zeroes": "unmap",
    }
    # drives.append(drive1)
    controller_namespace = {
        "id": drive_id,
        "drive": drive_id,
        "bus": controller_id,
        "nsid": nsid,
        "logical_block_size": 1 << lbads,
        "physical_block_size": 1 << lbads,
        **aux,
    }
    return drive, [
        "-drive",
        ",".join(f"{k}={v}" for k, v in drive.items()),
        "-device",
        ",".join(
            ["nvme-ns"] + [f"{k}={v}" for k, v in controller_namespace.items()]
        ),
    ]