Date: Wed, 9 Feb 2000 09:40:06 +0100 (CET) From: Oliver Fromme <olli@dorifer.heim3.tu-clausthal.de> To: freebsd-questions@FreeBSD.ORG Subject: Re: memory filesystem Message-ID: <200002090840.JAA49968@dorifer.heim3.tu-clausthal.de> In-Reply-To: <877803$2ot7$1@atlantis.rz.tu-clausthal.de>
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Chad David <davidc@guild.ab.ca> wrote in list.freebsd-questions:
> I have a need to create a memory filesystem
> on a system that boots from a CD. That means
> that besides a floppy, I have no writable media,
> and therefore, no swap.
> [...]
> and MFS seems to require a writable block device.
Such as /dev/zero. :-)
The only thing mfs_mount needs a device for is to find out the
disk type and size of the partition. If you specify the size
with -s and the disk type with -T (which can be any entry from
your /etc/disktab, such as "minimum" which is always present),
then you can simply use /dev/zero as device. It will simply
be ignored by mount_mfs.
So, for example, your /etc/fstab entry could look like this:
/dev/zero /tmp mfs rw,nosuid,-s=64000,-m=0,-T=minimum 0 0
We're using the above entry on our diskless websurf terminals,
which mount the whole system read-only via NFS, so we need a
small writable MFS for a few things, too. Works great.
Regards
Oliver
--
Oliver Fromme, Leibnizstr. 18/61, 38678 Clausthal, Germany
(Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)
"In jedem Stück Kohle wartet ein Diamant auf seine Geburt"
(Terry Pratchett)
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