[vserver] Strange NFS behavior

I have several hosts, each running multiple vservers. Each vserver
mounts several NFS volumes, including /home, from a NetApp via NFS v.3.
The /home volume filled completely yesterday (bad users!). Now, some
but not all of my vservers are not reporting any of the NFS volumes
anymore in df or mount, but they are still mounted. This isn't a major
problem (for me at least); just a curiosity I thought was worth
bringing up in case it points to anything more serious going on under
the covers.

The host OS is Debian Squeeze, the vservers are a mix of Squeeze and
Ubuntu Lucid (I'm seeing the same behavior in both vserver OS's). The
kernel and util-vserver are the versions from the standard squeeze
repos.

-- 
Dan Urist
durist@ucar.edu
303-497-2459