Exadata/Exalogic mount options

Problem :- We tried using data pump for exporting/importing a schema.
Database version :- 11.2.0.2.0(64-bit)
Machine :- Exadata/Exalogic(using NFS)

[oracle@****** ~]$ expdp system/******@dbm dumpfile=****.dmp schemas=ORACLE_OCM,DEV_MDS,DEV_ORABAM,DEV_SOAINFRA,DEV_ORASDPM, directory= DataPump_DIR

Export: Release 11.2.0.2.0 – Production on Fri Aug 12 16:29:01 2011

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Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 – 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
ORA-39002: invalid operation
ORA-39070: Unable to open the log file.
ORA-29283: invalid file operation
ORA-06512: at “SYS.UTL_FILE”, line 536
ORA-29283: invalid file operation

Solution tried :- Given full permissions 777 to directory and read/write to system DB user for data-pump.
But it didn’t work.. Actual problem is mounting options.

We ran following commands to mount NFS with Oracle:

1. mount 192.168.10.121:/export/dp_dir /mnt -O rw,noac,hard,rsize=32768,wsize=32768,nolock
2. service nfslock start

This solved the problem and we were successfully able to export/import using these mounting options and it was able to lock files