nfs4 mounting

[Trond Myklebust]

The Linux NFSv4 server has a somewhat messed up namespace. Whichever
partition is exported as 'fsid=0' is defined to be the root NFSv4
directory '/'. Anything which is not a subdirectory of that root
partition will never be seen by NFSv4.

Cheers
  Trond

On Fri, 2007-09-21 at 17:11 -0400, Saurabh Sehgal wrote:
> Hi, 
> 
> hmm ... maybe that is what the problem is ... I actually upgrades one
> of our machines to SLES 10 ... 
> 
> uname -a
> Linux amdha03 2.6.16.46-0.4-smp #1 SMP Mon Apr 2 17:59:08 UTC 2007
> x86_64 x86_64 x86_64 GNU/Linux 
> 
> I saw the nfsd4 daemon start up. However, anything other than the /
> directory I cannot mount  ( like you had previously suggested ) ...
> why is that .. how do I mount directories that are not / ... 
> 
> Plase let me know if there is anything else I need to do to mount
> non / directories .. I really appreciate your help ! 
> 
> rgds, 
> 
> Saurabh
> 
> 
> On 9/21/07, Trond Myklebust <trond.myklebust at fys.uio.no> wrote:
>         Oh... 2.6.5 Is that perhaps a SLES-9 kernel? I'm not sure they
>         include
>         support for NFSv4. 
>         
>         Trond
>         
>         
>         On Fri, 2007-09-21 at 16:43 -0400, Saurabh Sehgal wrote:
>         > yes, I have also tried with -t nfs4 options, and I get the
>         same error ...
>         >
>         > On 9/21/07, Trond Myklebust <trond.myklebust at fys.uio.no>
>         wrote:
>         > > On Fri, 2007-09-21 at 15:31 -0400, Saurabh Sehgal wrote:
>         > > > Hi,
>         > > >
>         > > > I tried mounting with 192.168.23.101:/  ... I still get
>         the same 
>         > > > error :
>         > > > nfs warning: mount version newer than kernel ..
>         > >
>         > > There should only be one version of the NFSv4 binary mount
>         protocol. Did
>         > > you remember the '-t nfs4'? 
>         > >
>         > > Trond
>         > >
>         > > > uname -a
>         > > > Linux amdha02 2.6.5-7.283-smp #1 SMP Wed Nov 29 16:55:53
>         UTC 2006
>         > > > x86_64 x86_64 x86_64 GNU/Linux
>         > > > 
>         > > > rgds,
>         > > >
>         > > > Saurabh
>         > > >
>         > > > On 9/21/07, Trond Myklebust <trond.myklebust at fys.uio.no>
>         wrote: 
>         > > >         On Fri, 2007-09-21 at 13:11 -0400, Saurabh
>         Sehgal wrote:
>         > > >         > Hi,
>         > > >         >
>         > > >         > I am working on a project that makes use of
>         nfs (v3) to 
>         > > >         concurrently
>         > > >         > write to a file across a network of four
>         machines ( to do
>         > > >         some record
>         > > >         > keeping ). Some tester on my team tried to
>         mount nfs as : 
>         > > >         >
>         > > >         > 192.168.23.101:/home /home nfs
>         > > >         > rw,hard,bg,intr,vers-v4,suid,tcp,timeo=600 0 0
>         > > >         >
>         > > >         > 
>         > > >         > The vers field of this mount line
>         in /etc/fstab is wrong,
>         > > >         but is
>         > > >         > ignored, and the mounting goes through.
>         However, during the
>         > > >         concurrent 
>         > > >         > reads/writes to the file, the file gets
>         corrupted.
>         > > >         >
>         > > >         > Any suggestions, on why might this be
>         happening ?, and what
>         > > >         really 
>         > > >         > happens when the vers field of the line is
>         specified as
>         > > >         such ? Any
>         > > >         > help is appreciated !
>         > > >
>         > > >         Please read http://nfs.sourceforge.net/#faq_a8
>         > > >
>         > > >         > Also, when I tried to mount nfs4 correctly by
>         issuing
>         > > >         something like: 
>         > > >         >
>         > > >         >
>         > > >         > mount -t nfs4 -o rw,hard,bg,intr
>         192.168.23.101:/home /home
>         > > >         >
>         > > >         > i get the following error : 
>         > > >         > root at amdha02 :/root# mount -t nfs4 -o
>         rw,hard,bg,intr
>         > > >         > 192.168.23.101:/home /ho >
>         > > >         > mount: wrong fs type, bad option, bad
>         superblock on 
>         > > >         > 192.168.23.101:/home,
>         > > >         >        or too many mounted file systems
>         > > >
>         > > >         Try mounting 192.168.23.101:/ instead
>         of /home...
>         > > >
>         > > >         Trond
>         > > >
>         > > >
>         > >
>         > >
>         
>