RHEL6.8: RHEL NFS server periodically does not respond to NFSv3 requests but responds with TCP ACKs to requests

Solution In Progress - Updated -

Issue

  • Periodically our RHEL6 NFS server stops responding to NFS requests and we see 'nfs: server XYZ not responding, still trying messages in the NFS client's /var/log/messages file
  • The unresponsiveness of the NFS server happens for only around 5-10 minutes, then resolves on its own.
  • The issue seems to occur around the top of the hour fairly regularly.
  • There are 2 clients affected by this issue. The issue seems to only happen on one client at a time.

Environment

  • Red Hat Enterprise Linux 6 (NFS server)
    • seen on kernel-2.6.32-642.1.1.el6
  • NFSv3

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