While doing expdp  the dumpfile to a NFS mount point, you may receive below error.

Error:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
ORA-39001: invalid argument value
ORA-39000: bad dump file specification
ORA-31641: unable to create dump file "/expdmp/LOY900/exp_loy_900_crmpre_01.dmp"
ORA-27054: NFS file system where the file is created or resides is not mounted with correct options
Additional information: 3
Additional information: 18

Solution:

Run the below statement as sysdba

SQL> alter system set events '10298 trace name context forever, level 32';

System altered

Now trigger the expdp again.

oracle@crmcpredb1:/expdmp/LOY900$ expdp parfile=exp_loy_900_crmpre.par

Export: Release 11.2.0.4.0 - Production on Mon Apr 18 12:39:34 2016

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Username: / as sysdba

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
Starting "SYS"."SYS_EXPORT_TABLE_08":  /******** AS SYSDBA parfile=exp_loy_900_crmpre.par
Estimate in progress using BLOCKS method...

METALINK ID : 1518979.1