How to troubleshoot intermittent NFS connectivity problems

Applies to

• ONTAP 9
• NFS

Description

• During intermittent NFS access issues, often only the client logs related messages, but ONTAP does not.
  • client OS /var/log/messages

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

• Required information:
  • When did this problem first start?
  • Is the problem specific to
    • remote clients?
    • local clients?
    • all clients?
  • What version of NFS protocols are affected?
  • How is this storage system connected to the network?
    • Is the storage system using a Gigabit Ethernet port?
    • Is the client/server connected via Gigabit or 100Base-T?
  • Is this problem constantly occurring or only at certain times?
  • There was an activity, even not directly related to the filer?