At the risk of this showing up twice since I entered it yesterday here

I am running NW6 SP5 on a Dell Poweredge 2800. The server rebooted and
did not mount VOL1. The server attemped to run vrepair and received the
following error. "Directory Tree is too deep" I increased the number of
subdirectories as a work around but need to determine who or what caused
this problem. How can I determine the root cause?