Ok I did a uname -a and found the same kernel.

Here is part of my /etc/fstab
====
abigail:/source /source         nfs     ro              0 0
/source/NetBSD-current/pkgsrc   /var/pkgsrc     union   rw,noauto,-b    0 0
====

mount reveals:
...
csserver2:/scilab/NetBSD/VAX/Csvax2/root on / type nfs
abigail:/source on /source type nfs (read-only)
...

An attempt to mount results in:
...
csserver4# mount /var/pkgsrc
mount_union: /source/NetBSD-current/pkgsrc on /var/pkgsrc: Operation not 
supported
...

I guess since I had to mount / via nfs that union mounts on another nfs
mounted area might be the problem.

I cannot mount root locally since there is a problem with the kernel and
MicroVax3100 and rz56s.

Looks like I'll have to try to get a kernel which works before I can do
union mounts.
johnh...
On Fri, 15 Sep 2000, Bertram Barth wrote:

> Date: Fri, 15 Sep 2000 21:18:47 +0200 (CEST)
> From: Bertram Barth <bertram@gummo.bbb.sub.org>
> To: port-vax@netbsd.org
> Subject: sources for sys for 1.5 Alpha2
> 
> John Hayward writes:
> > Dear Vax People,
> >    I attempted to do a union mount under 1.5 Alpha2 kernel and get
> > operation not supported.  I assume the union facility was not included in
> > building the kernel.
> 
> For me it worked just out of the box. "mount" displays:
> gummo:/usr/ports/distfiles on /usr/pkgsrc/distfiles type nfs (read-only, union)
> harpo:/x/tmp/distfiles on /usr/pkgsrc/distfiles type nfs (read-only, union)
> 
> Ciao,
> 	bertram
> 
> PS: m90# uname -a
> NetBSD m90 1.5_ALPHA2 NetBSD 1.5_ALPHA2 (GENERIC) #1: Tue Sep 12 09:14:10 PDT 2000     matt@cheetah.local:/other/vax/kobj/GENERIC vax
>