Medm overview showed white fields for h2nds0.

Found daqd process on h2nds0 had problems - last log message indicated "couldn't create interpreter thread; pthread_create() err=11" and "connection dropped on port 38943 from ; fd=17"

Two nds processes were running, one with an uninterruptible sleep state.  

Then the processes disappeared.

Restarted nds and daqd processes.