"No space left on device" Error!

I'm trying to simulate a design for 50 minutes but Simvision hangs up at ~ 10 minutes with the following error:

 error ncsim:  *E, SST2ER:  SST2 interface error:  No space left on device.

The design successfully simulates for smaller times (i.e. 2 minutes).  What is the cause?  Should I try altering settings in my interactive tracefile?  Like changing the probe command from "probe: create -shm -all -variables -depth all -waveform" to  "probe: create -shm -variable -depth to_cells -waveform"? 

 Please advise.  Thanks.