Intermittently receiving "NFS not responding" errors on the unix client

Applies to

• ONTAP 9+
• NFS

Issue

• There are frequent nfs time-outs alerts observed on the client side.
• Error received as:

Aug 27 13:22:54 ubuntu kernel: [259435.957429] nfs: server test93 not responding, still trying
Aug 27 13:23:08 ubuntu kernel: [259450.703137] nfs: server test93 OK
Aug 27 13:26:36 ubuntu kernel: [259658.162095] nfs: server test93 not responding, still trying
Aug 27 13:50:47 ubuntu kernel: [261109.661151] nfs: server test93 not responding, still trying
Aug 27 13:51:06 ubuntu kernel: [261128.092933] nfs: server test93 not responding, still trying
Aug 27 13:51:44 ubuntu kernel: [261166.098494] nfs: server test93 OK
Aug 27 13:51:44 ubuntu kernel: [261166.099052] nfs: server test93 OK

• No error received on the storage side.
• Verified with How to troubleshoot intermittent NFS access issues that there is no storage side issue