Why does NFS umounts itself during R12 upgrade

Dears,
We have a problem in NFS. When our oracle team in upgrading the oracle to R12, after a certain step the NFS umounts, from the client side the error as below,
Jun 23 10:16:53 bananadev01 nfs: [ID 733954 kern.info] NOTICE: [NFS4][Server: appledev01][Mntpt: /u02]NFS server appledev01 not responding; still trying
Jun 23 10:19:57 bananadev01 nfs: [ID 559769 kern.info] NOTICE: [NFS4][Server: appledev01][Mntpt: /u02]NFS server appledev01 ok
Jun 23 10:22:57 bananadev01 nfs: [ID 733954 kern.info] NOTICE: [NFS4][Server: appledev01][Mntpt: /u02]NFS server appledev01 not responding; still trying
On the server, there aint any error related to NFS.
Any help ?

Hi Murali,
We have a 11.5.10.2 instance with 10.2.0.5 database and we are Planning to upgrade the database to 11.2.0.3 during our upgrade R12.1.1, as per the note 761570.1, we have the Patch C and Path D available to us. We have decided to use the path C i.e upgrade the database to 11.2.0.3 during the R12 upgrade itself and no two downtime windows. As per this note 761570.1, in path c If the database upgrade is part of the R12 upgrade, perform all the steps in the Interoperabity Notes except the following steps:
Verify software versions
Run adgrants.sql
Implement and run Autoconfig
Re-create grants and synonyms
Restart Applications server processes
Apply Oracle Human Resources (HRMS) patch 7721754
so does that mean we don't have to apply any patches mentioned under Verify software versions like Interoperability patch , ATG Patch 7456837 etc.. on 11i ?
If you are planning to upgrade the database in the same downtime window of R12 upgrade, then you do not need to apply the patches under "verify software versions" section in the 11i doc. However, you need to consider applying the patches under the same section in (Interoperability Notes EBS R12 with Database 11gR2 [ID 1058763.1]). Those patches should be applied before you release the R12 instance to the users.
Thanks,
Hussein

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    We have a problem in NFS. When our oracle team in upgrading the oracle to R12, after a certain step the NFS umounts, from the client side the error as below,
    Jun 23 10:16:53 bananadev01 nfs: [ID 733954 kern.info] NOTICE: [NFS4][Server: appledev01][Mntpt: /u02]NFS server appledev01 not responding; still trying
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    Can you explain your setup and what the program is supposed to do? I am sure it could be done with 20% of the current code.
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