This sounds like an NFS question? You should ask on the Linux NFS
list:

On Wed, Jul 2, 2008 at 2:21 AM, KJ, Latesh wrote:
>
> Hi,
>
> On AIX 5.3 Kerberos when I mount a share of NetApp storage from Linux
> client having share access as anon=0. Files are created using nobody
> nobody. Any clues?
> Note: The NIS is same on filer and client.
>
> Thanks
> Latesh KJ