This article shows which OS versions support NFSv4. NFSv4 is enabled by default, but the target/staging hosts require additional configuration changes before it can be used.

Redhat/SLES: "NFSv4 Only - Enabling Recover Lost Locks" section under Linux/Redhat/CentOs.

AIXIBM AIX article.

OS versionNSFv4 support
RHEL 6.3 or laterSupported
SLES 11.4 or laterSupported
AIX 7.1, 7.2Supported 

If these target host configurations are not set, the engine will choose NFSv3. The provided reason (e.g., "OS not supported") that is shown for choosing NFSv3 over NFSv4 can be observed under the Status tab of the selected VDB in the Delphix Engine GUI. Additional information is provided in this tab for datasets and current values.

Dataset Status Tab NFS Reasons

NFS ReasonNotes
DefaultNFSv4 is used by default.
Old RedHatNFSv3 is used for versions of RedHat older than 6.3.
Unsupported OSNFSv3 is used for HP-UX and Solaris.
DNFSdNFS is in use and does not support NFSv4.
Tunable OverrideThe nfs.version tunable is set to force NFSv3.
Configuration OverrideAppears with default operation, implies that a configuration parameter has changed.
No Recover Lost LocksThe required Linux NFS client 'recover_lost_locks' setting is not enabled.
Unsupported Data PlatformNFSv3 is used with AppData.
Incomplete v4 Confignfsrgyd daemon is not running or reverse DNS lookup is missing.

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