about the filesystem

James Michael Fultz croooow at gmail.com
Sun Jan 31 16:39:48 UTC 2010


* Johnneylee Rollins <johnneylee.rollins at gmail.com> [2010-01-31 05:25 -0800]:
> On Sun, Jan 31, 2010 at 5:17 AM, Jeff Peng <jeffpeng at netzero.net> wrote:
> > The "df -h" shows:
> >
> > none                  956M  640K  955M   1% /dev/shm
> > none                  956M   84K  956M   1% /var/run
> > none                  956M     0  956M   0% /var/lock
> > none                  956M     0  956M   0% /lib/init/rw
> >
> > what are /var/lock and /lib/init/rw?
> > and what is "none" filesystem?
> > Thanks.
> 
> Those are the mount points, and since they don't exist as mount points
> but as folders in your filesystem, there is no location for them to
> display.

Well, not quite, sort of...  All of those are tmpfs mounts.  Those are
memory-backed filesystems, so there is no single block device backing
them.  It is traditional to use 'none' for such mounts, though an
arbitrary name is possible for better identification.

You can see the type of filesystem for those mounts by issuing the mount
command with no arguments or view the contents of '/proc/mounts'.




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