In Message <Pine.SUN.3.91.951026100751.9354V-100000@euston> ,
   David Brownlee <D.K.Brownlee@city.ac.uk> wrote:

=>	Is the upper layer a 4.4 filesystem?
=>	4.2 & 4.3 filesystems do not support whiteouts, which unionfs needs.
=>	(I got caught by this one :)
=>
=> [ ... ]
=>
=>	You can 'fsck -c 2 device'  to upgrade a filesystem to 4.4.
=>	(But make sure you do not do this to a root filesystem if it
=>	needs to be 4.3/4.2 (ie a sparc using sunos boot blocks))

   That was it. Thanks.

                                      Gary D. Duzan
                         Humble Practitioner of the Computer Arts