Ceph » rbd

rbd_op_threads is supposed to affect the number of threads in the ASIO thread pool in librados:

  auto rados_threads = m_cct->_conf.get_val<uint64_t>("librados_thread_count");
  auto rbd_threads = m_cct->_conf.get_val<uint64_t>("rbd_op_threads");
  if (rbd_threads > rados_threads) {
    // inherit the librados thread count -- but increase it if librbd wants to
    // utilize more threads
    m_cct->_conf.set_val("librados_thread_count", stringify(rbd_threads));
  }

However the actual number of threads appears to change only with librados_thread_count.