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Mounts with mountproto=udp goes in a hung state

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFS
  • Firewall

Issue

  • UDP mount operation goes in a hung state on the client machine.
  • A verbose mount shows multiple RPC timeouts:

[root@linux ~]# mount -o mountproto=udp -vvv 10.xx.xx.10:/vol1 /mnt/test
mount.nfs: timeout set for Thu Apr 15 10:46:35 2021
mount.nfs: trying text-based options 'mountproto=udp,addr=10.xx.xx.10,mountaddr=10.xx.xx.10'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 10.xx.xx.10 prog 100005 vers 3 prot UDP port 635
mount.nfs: trying text-based options 'mountproto=udp,addr=10.xx.xx.10,mountaddr=10.xx.xx.10'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 10.xx.xx.10 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 10.xx.xx.10 prog 100005 vers 3 prot UDP port 635
mount.nfs: portmap query failed: RPC: Timed out

 

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