Date: Fri, 15 Oct 2004 16:36:46 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: peadar.edwards@gmail.com Cc: freebsd-hackers@freebsd.org Subject: Re: NFS + VM question Message-ID: <200410151436.i9FEak3C008009@lurza.secnetix.de> In-Reply-To: <34cb7c8404101507297970e8dc@mail.gmail.com> from "Peter Edwards" at Oct 15, 2004 03:29:23 PM
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Peter Edwards wrote:
> On Fri, 15 Oct 2004 13:49:48 +0100, David Malone <dwmalone@maths.tcd.ie> wrote:
> > On Thu, Oct 14, 2004 at 04:27:38PM +0200, Oliver Fromme wrote:
> > > [...]
> > > If the memory isn't shared in this situation, is there a
> > > way to change the design so it can be shared? chroot and
> > > NFS are "musts", though.
> >
> > I don't think there is an easy way to get this caching to happen,
> > short of using hard links or some kind of union mount instead of
> > NFS.
>
> "nullfs" sounds like just the job here. ie, mount the NFS filesystem
> once, then use nullfs to graft it into each chroot area:
>
> mount host:/usr /mnt
> mount -tnullfs /mnt /jail/1
> mount -tnullfs /mnt /jail/2
>
> Of course, there's more overhead than if you weren't using the extra
> nullfs layer, but the caching works as you want.
Thanks for the explanation.
It really sounds like nullfs would be the solution for me,
but unfortunately, I can't use it because of the known pro-
blems of nullfs in FreeBSD 4-stable (which is the branch
that I'm using).
Best regards
Oliver
--
Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. 2, 80538 München
Any opinions expressed in this message may be personal to the author
and may not necessarily reflect the opinions of secnetix in any way.
> Can the denizens of this group enlighten me about what the
> advantages of Python are, versus Perl ?
"python" is more likely to pass unharmed through your spelling
checker than "perl".
-- An unknown poster and Fredrik Lundh
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