Xsan: Client cannot access certain folders on Xsan volume, or cannot access an entire volume

Xsan: Client cannot access certain folders on Xsan volume, or cannot access an entire volume (http://support.apple.com/kb/TS2742)

The solution is to run the following from terminal logged in as an administrative user:
sudo chflags nouchg /Volumes/<volume_name>
ex: sudo chflags nouchg /Volumes/DVS-rt0

To check what the current flags are use the -O (capital o) option for ls.  ex: ls -o /Volumes