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CONTAP-603281: FlexCache CIFS access may fail or experience slowness due to Remote Access Layer (RAL) cache thrashing

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ontap-9
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nas
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Issue

SMB/CIFS access through FlexCache volumes may intermittently fail or become slow when Remote Access Layer (RAL) cache thrashing occurs between cache and origin volumes.
Affected SMB clients may see failed TREE_CONNECT or CREATE requests with generic Windows errors such as STATUS_INTERNAL_ERROR. ONTAP EMS logs may record messages similar to:
 
Nblade.CifsOperationTimedOut: Detected a timed out CIFS operation. SMB command for this operation: SMB2_COM_CREATE, Number of times this command was suspended: #, Number of times th
is command was restarted: 0, Last CSM error during this operation: CSM_OK, Remote blade UUID: 123a1234-1a23-45bc-6de7-f12345a6a12a (nodename), Is QoS enabled: QoS_disabled, Last nBlade error during this operation: 410 (Spinnp op has timed out in WAFL), Client IP address: 10.1.1.2, Local IP address: 10.1.1.3, Target Vserver ID: ##, Target disk's DSID: 1234, Target Vserver Name: target_vserver_name

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