"NFS server initial call to nfs_server failed: I/O Error" when mounting NFSv4 because export policy only allows NFSv3

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Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: nas

Last Updated:

Applies to

ONTAP 9
NFS
Export policy

Issue

NFS client host client is unable to mount NFS export
- NFS server initial call to <nfs_server> failed: I/O Error

NFSv4 is enabled on the SVM

::> nfs show

Vserver: scoa

        General Access:  true
                    v3:  enabled
                  v4.0:  enabled
                   4.1:  enabled
                   UDP:  enabled
                   TCP:  enabled
                  RDMA:  enabled
  Default Windows User:  -
 Default Windows Group:  -

nfs connected-clients show says that client connected with NFSv4

::> nfs connected-clients show
  Node: nas-cm914-02
  Vserver: scoa
  Data-Ip: 172.16.136.24
Client-Ip      Protocol Volume    Policy   Idle-Time    Local-Reqs Remote-Reqs Trunking
-------------- -------- --------- -------- ------------ ---------- ----------  -------
172.16.136.2   nfs4     scoa_root default  4h 55m 11s   1          0           false
172.16.136.2   nfs4     scoa_vol1 default  4h 55m 11s   318        0           false
2 entries were displayed.