Earlier NFS client implementations use only a single TCP connection with a mount. In ONTAP, a single TCP connection can become a bottleneck with increasing IOPS.

nconnect improves NFS client performance by allowing multiple TCP connections (up to 16) for a single mount, helping to overcome the performance bottleneck that can occur with a single TCP connection as IOPS increases.

NFSv4.1 is enabled by default in ONTAP 9.9.1 and later. In earlier releases, you can enable it by specifying the -v4.1 option and setting it to enabled when creating an NFS server on the storage virtual machine (SVM).

ONTAP does not support NFSv4.1 directory and file level delegations.

Learn about nconnect for NFS performance.