FlexCache writeback and CifsOperationTimedOut errors

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Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: perf

Last Updated:

Applies to

ONTAP 9
FlexCache
CIFS

Issue

High CIFS latencies after updating to ONTAP version 9.16.1
Performance issues observed on both client and filer sides
Write-back is enabled
In some cases, the time between data requests exceeds 2000 seconds, leading to timeout sessions and data corruption
EMS error:

Mon Nov 17 07:39:37 +0100 [cluster01: kernel: ems.engine.suppressed:debug]: Event 'Nblade.CifsOperationTimedOut' suppressed 2 times in last 138539 seconds.

Mon Nov 17 07:39:37 +0100 [cluster01: kernel: Nblade_CifsOperationTimedOut_1:error]: params: {'commandName': 'SMB2_COM_CREATE', 'suspensionCnt': '497262', 'cmdRestartCnt': '0', 'lastCsmError': 'CSM_OK', 'remoteBladeID': '000a0000-0000-00a0-00a0-a000aaaa00a0 (node_name01)', 'isQosEnabled': 'QoS_disabled', 'lastSpinNpError': '3018', 'clientIpAddress': '1.1.1.1', 'localIpAddress': '2.2.2.2', 'vserverId': 'x', 'dsId': 'xxxx', 'vserverName': 'vserver_name01', 'volumeName': 'volume_name01'}

Example statistics:

Object: csm_session

Instance: 0xxxxxxxxxxxxxxxxxx

Start-time: 11/4/2025 14:16:39

End-time: 11/4/2025 14:16:50

Elapsed-time: 11s

Scope: node01

Counter Value

---------------------------- -----------

spinnp_op_latency 1106162us

spinnp_req_service_latency 39us