[OpenIndiana-discuss] nfs mounting and cascading dataset access?

[Scott LeFevre]

Doug,

Thanks for the info.  My client is NFSv3.  I tested w/ a NFSv4 client
and it works as I wanted/expected.  

Cheers,
Scott LeFevre


On Mon, 2012-02-27 at 11:39 -0500, Doug Hughes wrote:

> On 2/27/2012 11:32 AM, James Carlson wrote:
> > Scott LeFevre wrote:
> >> I have a pools setup named tank1 with multiple datasets/filesystems
> >> defined.  At the top, I have tank1/media followed by tank1/media/Video
> >> and tank1/media/Music.  I've setup tank1/media as a nfs share
> >> (e.g. /export/media) and can mount it from other systems.  When I try to
> >> access media/Video from the nfs client, it shows an empty directory.
> >> (From the oi 151a2 host, everything shows up locally.)   I can mount
> >> tank1/media/Video directly from the nfs client and everything shows up
> >> as it should.
> >>
> >> Is there a way to make this work where I expose just tank1/media as an
> >> nfs export and can access the underlying datasets/filesystems (e.g.
> >> Video and Music)?
> > This isn't really a special issue with ZFS.
> >
> > NFS has always done exports by file system.  If you have /foo and
> > /foo/bar, and /foo/bar is a mount point for some other file system, then
> > exporting /foo does not give clients access to the contents of /foo/bar,
> > because there's no way to cross the file system boundary.  Instead,
> > clients looking at /foo/bar will see there whatever is actually in the
> > /foo file system -- probably just an underlying empty directory used as
> > the mount point.
> >
> > What you can do is set "sharenfs=on" (or some list of NFS options
> > instead of just "on") using the zfs command on tank/media, and all of
> > the filesystems under that point will inherit this setting.  That means
> > that clients will see separate NFS exports for each of the underlying
> > datasets -- one for Video and one for Music in this case.
> >
> > Automount, of course, is your friend.  ;-}
> >
> You can do this (hierarchical implicit shared subfs) with NFSv4, but not 
> with NFSv3. There's a lot more setup for V4 though and it would likely 
> not be as robust.
> 
> _______________________________________________
> OpenIndiana-discuss mailing list
> OpenIndiana-discuss at openindiana.org
> http://openindiana.org/mailman/listinfo/openindiana-discuss