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execsOverLimit message found in event logs for NFSv4.1 / NFSv4.2 clients

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9.8 and higher
  • NFS v4.1 and NFS v4.2

Issue

  • Error in EMS.log:

NETAPP03: kernel: nblade.execsOverLimit:error]: The number of in-flight requests from client with source IP 10.20.30.40 to destination LIF 10.20.30.50 (Vserver 7) is greater than the maximum number of in-flight requests allowed (128). The client might see degraded performance due to request throttling.

Note: This message has been moved to severity NOTICE in ONTAP 9.12.1

  • This message is normal and expected when the Oracle dNFS client is in use. It does not indicate a problem.
  • Clients may report increased latency that coincides with times when this message is seen
  • Session slot table is set to a higher value than 128 (default 180):

::> set -privilege advanced
::*> vserver nfs show -vserver <SVM_NAME> -fields v4.x-session-num-slots

 

Solution

  • No changes are required if the source of the execsOverLimit message includes an Oracle dNFS client. These messages are normal and expected.
  • If the client specified in the message is not experiencing performance issues consider the message informational
  • ​​​​​If the client specified in the message is experiencing performance issues:
    • Modify the max slot table value:
      • ::> set -privilege advanced
      • ::*> vserver nfs modify -vserver <SVM_NAME> -v4.x-session-num-slots 128

Note: Changing the -v4.x-session-num-slots value does not impact existing connections.  Clients need to remount the export for this change to take effect.

 

 

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