Date: Tue, 15 Feb 2005 11:31:28 -0500 (EST) From: "Ean Kingston" <ean@hedron.org> To: "Erik Norgaard" <norgaard@locolomo.org> Cc: freebsd-questions@freebsd.org Subject: Re: Diskless NFS mounts weirdness Message-ID: <3112.216.220.59.169.1108485088.squirrel@216.220.59.169> In-Reply-To: <42122150.9030300@locolomo.org> References: <20050215142237.GC56849@fw.farid-hajji.net> <42122150.9030300@locolomo.org>
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> cpghost@cordula.ws wrote: > >> 1. /var *is* actually mounted on >> 192.168.122.1:/pool/diskless_rw/192.168.122.11/var >> but it is not listed in mount(8)s output. Why? >> >> 2. Which part of the system created /dev/md0 and mounted that >> on /var? I don't need that and would like to save some RAM >> anyway. > > I guess you are using 5.3 or newer? the /etc/rc.d/diskless script has > been replaced, by among other things, a script /etc/rc.d/var which > creates a memory disk, /dev/md0, using up your precious ram. > > I have tried to remove the script but get an error because nfs wants to > update the /var/db/mounttab - before /var is actually mounted - so the > mount fails. > > The /etc/rc.d/var script creates a memory disk if it detects that /var > is read-only - which is the case since the nfs mount failed. And the > memory disk is then populated. > > If the root partition is rw-mounted the nfs-mount will succeed. > > If you have enough ram this is not a problem, simply let var be a memory > disk. You can set the size of the memory disk in rc.conf. > > > /dev/md0 on /var (ufs, local, soft-updates) > > 192.168.122.1:/pool/diskless_rw/192.168.122.11/var on /var (nfs) > > Now this is wierd - how can you have to mounts on the same mount point? Wierd yes, but very easy to do. A mount point is just a directory. That directory does not have to be empty. First /dev/md0 was mounted, then the NFS share was mounted. So, the NFS share is what is being used as /var. This indicates poor design (or an error). -- Ean Kingston E-Mail: ean_AT_hedron_DOT_org URL: http://www.hedron.org/
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