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SMB2 Tree Connect Timeout and High Latency on FlexCache Destination Volume

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Category:
ontap-9
Specialty:
nas
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Applies to

  • ONTAP 9
  • FlexCache
  • CIFS\SMB

Issue

Users experienced the following symptoms on a FlexCache destination volume:

  • High latency reported on FlexCache destination volume (latency spikes to tens of thousands of ms)
  • IOPS and throughput are 0 during the high latency period
  • CIFS/SMB shares hosted on FlexCache volume become inaccessible or cannot be mounted
  • SMB2 tree connect operations timeout

Relevant EMS Log Output:

[kernel:Nblade_CifsOperationTimedOut_1:error]: params: {'commandName':'SMB2_COM_TREE_CONNECT', ... 'lastSpinNpError':'3010', ...}
[UtilFsmThread:flexcache.originDisconnected:EMERGENCY]: FlexCache volume ... is disconnected from its origin volume ...
[mgwd:cpeer.unavailable:alert]: Peer cluster is no longer available.

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