The NFS connectivity between a RHEL 6 NFS client and a RHEL 6 NFS server is not stable

Solution In Progress - Updated -

Issue

  • On a two node production RHEL 6.3 Oracle RAC system, which has two NFS shares mounted from another RHEL 6.3 system, Everything works fine for a few days. Suddenly one of the nodes will stop being able to access the NFS mounts while the other is working fine. The system can reach the NFS server, but cannot reach it through nfs. This results in the database hanging, since these mounts are used by oracle rac.

  • RHEL NFS client syslog contains:

Aug 19 10:50:17 hostname1 kernel: nfs: server NFS-SERVER-HOSTNAME not responding, still trying

Environment

  • Red Hat Enterprise Linux 6.3

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