Automatic NFS mount at boot intermittently fails because client's mount attempt times out

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Category:: ontap-9

Specialty:: nas

Last Updated:

Applies to

ONTAP 9
NFS

Issue

Client host is configured to mount NFS exports automatically at boot, but sometimes NFS exports do not mount
On the NFS server, NFSv3 is enabled, and NFSv4 is disabled
Packet trace shows that the client tries and fails to mount NFSv4, waits, then does not fully attempt to mount nfs4
1. Client starts NFSv4 mount procedure by sending V4 NULL Call
2. Server replies with V4 NULL Reply RPC Accept Error: remote can't support version # (low=3, high=3), indicating that NFSv4 is disabled
3. Client sends no traffic for a period of time
4. Client starts NFSv3 mount procedure by sending V2 GETPORT Call NFS V:3 TCP
5. Client never sends V3 MNT Call /nfs_export, which is needed to complete the NFSv3 mount procedure

Client host's event log says that the mount process timed out

Feb 21 14:25:27 crdmsaptz7f40 systemd[1]: Mounting /path/to/nfs_export...
Feb 21 14:26:57 crdmsaptz7f40 systemd[1]: nfs_export.mount mounting timed out. Stopping.
Feb 21 14:26:57 crdmsaptz7f40 systemd[1]: nfs_export.mount mount process exited, code=killed status=15
Feb 21 14:26:57 crdmsaptz7f40 systemd[1]: Failed to mount /path/to/nfs_export.