> Date: Fri, 11 Aug 1995 19:14:53 +0100 (BST)
> From: David Brownlee <D.K.Brownlee@city.ac.uk>

> 	Maybe I'm being blind here, or just plain dumb - but I cannot
> 	seem to get union mounts working on my NetBSD/sun3 (NetBSD/i386
> 	works fine).
> 
> 	Both have kernels with options UNION, but the PC likes
> 
> 	mkdir /tmp/mount ; mount_union /tmp/mount /usr/share/doc/
> 
> 	while the sun3 complains
> 
> 	mount_union: Operation not supported
> 
> 	for the same command...
> 
> 	Is there something obvious I'm missing? (help! :)

You probably are trying to union mount over a filesystem that
does not support "whiteout" operations (i.e. old format FFS).
If you are trying to retain SunOS compatibility, I'd suggest
keeping root and usr in old format and /home in new format.

Gordon