def METHOD_NAME(guest_session=None):
    """"
    Get scsi debug disk on host or on guest which created as scsi-block.
    """
    cmd = "lsblk -S -n -p|grep scsi_debug"
    if guest_session:
        status, output = guest_session.cmd_status_output(cmd)
    else:
        status, output = process.getstatusoutput(cmd)
    if status != 0:
        test.fail("Can not find scsi_debug disk")
    return output.split()[0]