RHEL: NFS hangs after upgrading from RHEL5 to RHEL6

Solution In Progress - Updated -

Issue

  • We have eight rhel 5 servers that we started upgrading to rhel6 (fresh clean install), what we have discovered after upgrading a couple is that in rhel 6, the NFS locks up after a bit of heavier traffic to the nfs.
Jul 14 14:02:05 client kernel: nfs: server server not responding, still trying
Jul 14 14:02:10 client kernel: nfs: server server not responding, still trying
Jul 14 14:02:10 client kernel: nfs: server server not responding, still trying
Jul 14 14:02:38 client kernel: nfs: server  OK
Jul 14 14:02:38 client kernel: nfs: server  OK

We can reproduce this every time. However, we can not duplicate this on rhel 5 servers on the same network. We can duplicate this on different hardware and even a VM. We use the same NFS mount options as we did with RHEL5 etc. etc. etc. but it locks up every time.

Environment

  • Red Hat Enterprise Linux 6
  • NFS

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