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Frequent NFS APDs after upgrading ESXi 5.5 to U1

If you’re using NFS storage and have not yet upgraded to 5.5 Update 1 – DON’T DO IT YET!

VMware have just released KB2076392 stating that there is a known issue affecting ESXi 5.5 U1 hosts with NFS storage. Here’s an excerpt from the KB:

“When running ESXi 5.5 Update 1, the ESXi host frequently loses connectivity to NFS storage and APDs to NFS volumes are observed. You experience these symptoms:

  • Intermittent APDs for NFS datastores are reported, with consequent potential blue screen errors for Windows virtual machine guests and read-only filesystems in Linux virtual machines.
    Note: NFS volumes include VSA datastores.
  • For the duration of the APD condition and after, the array still responds to ping and netcat tests are also successful, and there is no evidence to indicate a physical network or a NFS storage array issue.
  • The NFS storage array logs and traces also do not indicate any evident issue, other hosts not running ESXi 5.5 U1 continue to work and can read and write to the NFS share without issue.”

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