rdma-ndd man page

RDMA-NDD — RDMA device Node Description update daemon


rdma-ndd <options>


rdma-ndd is a system daemon which watches for rdma device changes and/or hostname changes and updates the Node Description of the rdma devices based on those changes.


Full operation of this deamon requires kernels which support polling of the procfs hostname file as well as libudev.

If your system does not support either of these features, the daemon will set the Node Descriptions at start up and then sleep forever.

Node Description format

The deamon uses the nd_format configuration option within the ibdiags.conf file. %h and %d can be used as wildcards in that string to specify the dynamic use of <hostname> and <device> respectively.

NOTE: At startup and on new device detection the Node Description is always written to ensure the SM and this daemon are in sync. Subsequent events will only write the Node Description on a device if it has changed.


--retry_timer, -t
Length of time to sleep when system errors occur when attempting to poll and or read the hostname from the system.
--retry_count, -r
Number of times to attempt to retry setting of the node description on failure. Default 0
--foreground, -f
Run in the foreground instead of as a daemon
--pidfile <pidfile>
specify a pid file (daemon mode only)

Configuration flags

--config, -z <config_file> Specify alternate config file.

Default: /etc/infiniband-diags/ibdiag.conf

Debugging flags

-h, --help show the usage message

-V, --version show the version info.


Config File


A global config file is provided to set some of the common options for all tools. See supplied config file for details.


Ira Weiny
< ira.weiny@intel.com >