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vSphere hosts crash after MaxQueueDepth change on NetApp AFF-A90

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ontap-9
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Applies to

  • ONTAP 9
  • VMware vSphere ESXi
  • NFS protocol
  • Broadcom (VMware parent company)

Issue

  • In the vSphere environment, the NFS.MaxQueueDepth and NFS41.MaxQueueDepth values were changed from 4294967295 to 128 based on NetApp KB recommendations.
  • Approximately 42 hours after this change, all ESXi hosts running virtual machines on NetApp storage (AFF-A90 running ONTAP 9.15.1P6) experienced rolling PSODs (Purple Screen of Death), resulting in the hosts going offline and a full environment crash.
  • The PSODs referenced the InfSvc41Client module with involvement of NFS41_SchedTaskSubmit, NFS41FileOp, and SwapIOClusterWriteWrapper. ESXi hosts running virtual machines on other storage devices were not affected.
  • The issue occurred on the 'RangeCluster' ESXi hosts after they were rebooted to apply the MaxQueueDepth changes. The 'PRODCluster' hosts, which did not have the MaxQueueDepth changed, were unaffected.
  • PSOD stack traces is:
    Failed to insert scheduling element:0x432f2aaadcdO into the priQ:0x432f2a404950. Reason:Limit exceeded
    NOT_IMPLEMENTED bora/vmkernel/sched/memsched_kmem.c:1436

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