Date: Thu, 27 May 2010 18:30:07 -1000 From: Clifton Royston <cliftonr@lava.net> To: Dave Hayes <dave@jetcafe.org> Cc: freebsd-stable@freebsd.org Subject: Re: Locking a file backed mdconfig into memory Message-ID: <20100528043006.GA18560@lava.net> In-Reply-To: <201005272348.o4RNmgWh014243@hugeraid.jetcafe.org> References: <201005272348.o4RNmgWh014243@hugeraid.jetcafe.org>
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On Thu, May 27, 2010 at 04:48:42PM -0700, Dave Hayes wrote:
> On FreeBSD 7.3-STABLE I'm mounting a DVD and doing something like
> this:
>
> mdconfig -a -t vnode -o reserve -o readonly -f /dvd/file
>
> so that /dvd/file becomes the backing storage for my memory
> disk.
It sounds like what you really want is to load the contents of the
specified file as a memory system? That's not part of mdconfig's
repertoire, to the best of my recollection.
If that's what you want, you need to use a different tool; the purpose
of mdconfig is to provide scratch disk. The backing store is to
specify a region its contents can be swapped out to if the system is
under memory pressure (which certainly won't work with a DVD)
-- Clifton
--
Clifton Royston -- cliftonr@iandicomputing.com / cliftonr@lava.net
President - I and I Computing * http://www.iandicomputing.com/
Custom programming, network design, systems and network consulting services
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