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High CREATE or OPEN latency when many clients attempt to access the same file

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • Users may experience high latency
  • The latency will be seen in qos statistics volume latency show in the Data column
  • Starting with fixed releases for bug CONTAP-78130, this message may be seen in the EMS/event log:
Nblade.delayedOplockBreakAck: SMB Clients are showing delays in responding to oplock recalls, potentially due to network latency, heavy processing load, or other factors impacting responsiveness. ONTAP will suspend when locks are assigned to the same file from different clients, which may result in high wait time for CREATE/OPEN calls.

 

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