Date: Thu, 5 Sep 2002 15:43:11 +0100 From: Ceri Davies <setantae@submonkey.net> To: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com> Cc: freebsd-questions@freebsd.org Subject: Re: mount(8) mount_union(8) and the slippery wet floor... Message-ID: <20020905144311.GA13872@submonkey.net> In-Reply-To: <44bs7c1phq.fsf@be-well.ilk.org> References: <5.1.0.14.0.20020904132723.00bc28e8@mail.lusidor.nu> <20020904124832.GA15994@submonkey.net> <44y9ahecn2.fsf@be-well.ilk.org> <20020905091754.GE10717@freepuppy.bellavista.cz> <44bs7c1phq.fsf@be-well.ilk.org>
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On Thu, Sep 05, 2002 at 10:26:57AM -0400, Lowell Gilbert wrote:
> Roman Neuhauser <neuhauser@bellavista.cz> writes:
> > # freebsd-questions-local@be-well.no-ip.com / 2002-09-04 16:13:53 -0400:
> > > Ceri Davies <setantae@submonkey.net> writes:
> > > > On Wed, Sep 04, 2002 at 01:46:42PM +0200, Jimmy Lantz wrote:
> > > > >
> > > > > Is the mount union mentioned in MOUNT(8) also affected by the
> > > > > slippery wet floor in MOUNT_UNION(8)??
> > > > > Or can I safely use the mount with the option union?
> > > >
> > > > They are the same thing.
> > >
> > > For the record, they are *not* the same thing.
> >
> > could you elaborate?
>
> I'm not 100% sure that I completely understand the technical details,
> but I'll give it a shot. You could go check the archives of the
> freebsd-fs list for more authoritative information on the subject.
It's a fair cop.
For the sake of the list, here are the results of my experiments with this.
# mount -o union /dev/ad6s2f /tmp/mnt/
results in :
/dev/ad6s2f on /tmp/mnt (ufs, local, union, soft-updates)
while:
# mount -t union /usr/obj /tmp/mnt2/
results in:
<above>:/usr/obj on /tmp/mnt2 (union, local, noclusterw)
Yes, they're different.
Yes, they do the same thing.
Yes, Lowell was right, and I'll never doubt it again.
Ceri
--
you can't see when light's so strong
you can't see when light is gone
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