RHEL5.8: NFSv4 operations intermittently result in I/O errors, specifically lost WRITE's

Solution Verified - Updated -

Issue

  • Informatica session logs indicate IO errors occur periodically
  • IO errors often occur during peak times of 1am to 5am
  • Periodically NFS transactions never make it to the NFS server and the client states it cannot connect to the server:
Oct 19 04:08:38 hostname _k_e_r_n_e_l_: nfs: server nfs-server not responding, still trying
Oct 19 04:08:38 hostname _k_e_r_n_e_l_: nfs: server nfs-server not responding, still trying
Oct 19 04:08:44 hostname _k_e_r_n_e_l_: nfs: server nfs-server not responding, still trying

Environment

  • NFS Client
  • NFS Server
    • NetApp: Ontap 8.02P3 (7-mode)
  • Mostly NFSv4 but NFSv3 also used to mount some exports from the same NFS server
    • Specifically the top level mount is an NFSv3 mount. Underneath the top level mount are many additional NFS mounts that are both V3 and V4.
  • Application which does repeated sequences of the following NFSv4 operations
    • OPEN
    • WRITE
    • CLOSE

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