HP-UX 11.0 NFS Client Problem with LINUX 2.4 NFS Server

[Anitha_3]

I have an environment where an HP-UX 11.0 server is acting as an applications server. One of the applications (Oracle 8.1.6) is attempting to mount a RedHat Linux Based (2.4) system in order to provide multiplexed storage for certain Oracle files. When Oracle (on the HP-UX Server) attempts to create / lock the database files on the Linux Server, I receive the following errors in the Oracle alert log:
:
ora-19504: failed to create file ""
ora-27086: skgfglk: unable to lock file - already in use
HP-UX error: 13 : Permission denied
Additional information: 8

The file is actually created "correctly", and the permissions are as expected (-rw-r--r--). The NFS mount is being exported rw and being mounted rw. The HP-UX user creating the database is the owner of, and has rwx permissions on the related NFS directories on the Linux system. As well, the HP-UX user can vi, copy, move and delete files on the NFS mount without problems. It is only when locking the file(s) that the failure occurs. If I change the NFS Server to another HP-UX system (also running 11.0), I do not have the failure. Also, if I run Oracle on a Linux NFS client to the Linux NFS Server, I do not see the problem. This appears to be something between HP-UX and Linux. By the way, I am not currently using NIS or NIS+.

I think I have all the current HP-UX patches, although it is difficult to say for sure.

Any ideas or things to try would be greatly appreciated

thanks & regards,
Govind