Broker storage growing

webM 6.1 our Broker.qs.stor unix file keeps growing. We created the broker with a max size for the broker.qs.stor of 2G. The unix statistics confirm that our Broker.qs.stor file is now at its max size and the statistics from the Broker server utilization page show the reserved and max storage values are at 100% utilization. But the Used storage value is at 7K or 0%. Anyone familiar with how the webM broker utilizes the space in the Broker.qs.stor file? It’s seems that once you have used its space to the limit it stays at that size even though it is not needed, so we are basically now reserving a 2G empty file? We thought this file would come back down in size after use.
Thanks for any tips…