A normal restart of the write server gives up its free list, so that
      you can shut it down and drop it.
Prerequisites
If, for some reason, the write server cannot start, follow this process.
Task- Verify that the write server process is dead and cannot be
               started.
- Restart the coordinator with the -iqmpx_reclaimwriterfreelist
               switch. This forces the coordinator to reclaim the writer's free list and you can
               then drop it. 
               Warning!  If the write server process is
                  still writing to the database when the coordinator reclaims its free list,
                  database corruption may result.