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Direct NFS: FAQ (Doc ID 954425.1)

Last updated on OCTOBER 30, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.7 to 12.1.0.2 [Release 11.1 to 12.1]
Oracle Database - Enterprise Edition - Version 12.2.0.1 to 12.2.0.1 [Release 12.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Purpose

The purpose of this article is to provide answers for the frequently asked questions about 11g new feature direct NFS.

Questions and Answers

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In this Document
Purpose
Questions and Answers
 What is direct NFS?
 When using direct NFS, is there still a need for an operating system nfs software required to mount the NFS filesystem?
 How can the direct NFS usage be verified?
 Why do we unable to see anything from v$dnfs% views?
 When does Direct NFS mount the volumes? 
 Do DNFS volumes need to be mounted by Operating System (kernel NFS)?
 What type of files can be accessed by direct NFS?
 What is oradism? When is it used by Direct NFS?
 Are NFS v4 and automount supported with dNFS (Direct NFS) in 11g?
 What is the usage of Direct NFS channels?
 "Direct NFS: NFS3ERR 2 No such file or directory. path 192.xxx.xxx.1 mntport 4046 nfsport 2049". What does this mean?
 Are jumbo frames supported with Direct NFS?
 Can multiple Direct NFS paths be configured in the same subnet?
 "ORA-17500: ODM err:KGNFS READ FAIL:Permission denied" when using multiple paths with Direct NFS client. How do I fix it?
 Why HCC queries return "ORA-64307: hybrid columnar compression is not supported for tablespaces on this storage type"?
 Are there any issues with enabling Direct NFS for SAN deployments?
 Does Direct NFS + HCC support a community string other than "public" for SNMP?
 We are using nested NFS mounts and have trouble accessing the files in the child NFS mount, why?
 Files created using Direct NFS are not available via the OS for over a minute after being successfully created. What is the cause for this and is something wrong?
References

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