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CONTAP-473457: CIFS/SMB multichannel read/write Performance degradation observed when using FlexGroups

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Issue

  • When attempting to write data to a CIFS share located on a FlexGroup volume using tools such as FastCopy or standard Windows file operations, the write process intermittently fails or times out
  • This is observed only on FlexGroup volumes (not FlexVols) and typically with large files (e.g., >25GB). Smaller files and FlexVol-based CIFS shares are not affected.
  • Error observed from the client : 

WriteFileWait(An internal error occurred. 1359)
  • Errors observed in ems.log during the issue: 

[NODE01: kernel: ems.engine.suppressed:debug]: Event 'Nblade.CifsOperationTimedOut' suppressed 26 times in last 409 seconds.
[NODE01: kernel: Nblade_CifsOperationTimedOut_1:error]: params: {'commandName': 'SMB2_COM_WRITE', 'suspensionCnt': '2', 'cmdRestartCnt': '0', 'lastCsmError': 'CSM_OK', 'remoteBladeID': '0534aa0e-304e-11f0-9bce-d039ead4f351 (NODE01)', 'isQosEnabled': 'QoS_disabled', 'lastSpinNpError': '410 (Spinnp op has timed out in WAFL)', 'clientIpAddress': '192.168.1.116', 'localIpAddress': '192.168.1.26', 'vserverId': '1', 'dsId': '1170', 'vserverName': 'SVM1', 'volumeName': 'Volume__0002'}

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