Subject: Re: What's up with union fs?
To: Ken Nakata <firstname.lastname@example.org>
From: Noriyuki Soda <email@example.com>
Date: 06/27/1995 19:11:41
>>>>> On Mon, 26 Jun 1995 23:47:44 -0400,
firstname.lastname@example.org (Ken Nakata) said:
> I'm sorry if this is a dumb question, but I keep getting this:
> [~]$ mount -t union -o -b /usr/src/sys $HOME/sys
> union: Operation not supported
> It's the same if root does this. I have "options UNION" in my
> config file, of course. My system is current as of June 20th.
I think your $HOME/sys partition is mounted by NFS.
If you'd like to use UNION-fs read-write mounting, you have to use
UFS (== FFS/MFS/LFS) partition as top layer.
If top layer is NFS, you cannot mount read-write, but read-only.
Probably you can use "mount -t null -o union" for sys/arch/XXX/conf
and sys/arch/XXX/compile in this situation, instead of "mount -t union".
email@example.com Software Research Associates, Inc., Japan
(Noriyuki Soda) software tools and technology group