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    • What is the recommended Oplock configuration
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/What_is_the_recommended_Oplock_configuration
      Applies to ONTAP 9 CIFS Answer Support for lease oplocks is enabled on SMB shares and volumes by default. Lease oplocks are essential for nondisruptive SMB operations in ONTAP. NetApp recommends that ...Applies to ONTAP 9 CIFS Answer Support for lease oplocks is enabled on SMB shares and volumes by default. Lease oplocks are essential for nondisruptive SMB operations in ONTAP. NetApp recommends that you do not disable them. Additional Information additionalInformation_text
    • Files on CIFS share open slowly because oplocks are disabled
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Files_on_CIFS_share_open_slowly_because_oplocks_are_disabled
      Opening files takes significantly longer than expected Certain CIFS shares may be impacted while others appear normal / no impact In some cases, problem occurs on VPN connection, but not local network...Opening files takes significantly longer than expected Certain CIFS shares may be impacted while others appear normal / no impact In some cases, problem occurs on VPN connection, but not local network connection In some cases, specific file types are more severely impacted In some cases, specific client applications are more severely impacted Client is sending many small operations instead of large contiguous requests Client is requesting very short read lengths
    • Does CIFS needs to be restarted when disabling or enabling oplocks?
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Does_CIFS_needs_to_be_restarted_when_disabling_or_enabling_oplocks
      ​ ​ ​ Applies to Data ONTAP 9 CIFS/SMB Answer No, when enabling or disabling oplocks it takes effect immediately. No termination or restart of CIFS is required. But only new sessions will have the lat...​ ​ ​ Applies to Data ONTAP 9 CIFS/SMB Answer No, when enabling or disabling oplocks it takes effect immediately. No termination or restart of CIFS is required. But only new sessions will have the latest update. Additional Information
    • NFS client temporarily fails to delete a file created for a CIFS client to read
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/NFS_client_temporarily_fails_to_delete_a_file_created_for_a_CIFS_client_to_read
      NFS (v4) client attempts to delete a file by issuing a REMOVE call, but receives NFS4ERR_FILE_OPEN An NFS client creates and writes a file for import by a CIFS client (SQL Server is a known example) C...NFS (v4) client attempts to delete a file by issuing a REMOVE call, but receives NFS4ERR_FILE_OPEN An NFS client creates and writes a file for import by a CIFS client (SQL Server is a known example) CIFS client fully reads the import file, but does not close the file proactively, preventing the NFS writer from deleting it until the oplocks held by the CIFS client expire
    • High CREATE or OPEN latency when many clients attempt to access the same file
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_CREATE_or_OPEN_latency_when_many_clients_attempt_to_access_the_same_file
      The latency will be seen in qos statistics volume latency show in the Data column Nblade.delayedOplockBreakAck: SMB Clients are showing delays in responding to oplock recalls, potentially due to netwo...The latency will be seen in qos statistics volume latency show in the Data column 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.