ORA-31617: unable to open dump file “/export/data.dmp” for write

This morning a user came to me because they were getting what appeared to be a Permission error

FLASHBACK automatically enabled to preserve database integrity.
Starting "myschema"."SYS_EXPORT_SCHEMA_06":
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 252.1 GB
ORA-31693: Table data object "myschema"."mytable" failed to load/unload and is being skipped due to error:
ORA-31617: unable to open dump file "/nfs/unix/export/myschema01.dmp" for write
ORA-19505: failed to identify file "/nfs/unix/export/myschema01.dmp"
ORA-17503: ksfdopn:4 Failed to open file /nfs/unix/export/msychema01
ORA-17500: ODM err:File does not exist

I checked the directory listed, /nfs/unix/export. It is mounted on both nodes of the cluster.

Checked file permissions, using touch I created a file as the oracle user, and deleted it, no permissions issues there.

It turns out it was the directory object itself! I looked at the job definition, and it was using the directory /export

Export is a link to the /nfs/unix/export directory. The second node had link, but not the first! What threw me off was the directory object itself was only pointing to /export, but the error message was pointing to the full NFS path. Dropping and re-creating the directory object in the database pointing to /nfs/unix/export/ resolve the issue.