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ChangeNotify を備えた CIFS FlexGroup が応答しなくなります

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ontap-9
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環境

ONTAP 9.2 以降

問題

  • FlexGroup または LUN で数秒のレイテンシが発生します
  • LUN で読み取りまたは書き込みを実行できないため、 SAN 通信が応答しなくなります
    • レイテンシが高いのは次のような場合 qos statisticsです。
       Cluster::> qos statistics latency show -node node1 Policy Group Latency Network Cluster Data Disk QoS Max QoS Min NVRAM Cloud FlexCache SM Sync VA -------------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -total- 10.44s 10.44s 38.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms policy_group_1 18.03s 18.03s 72.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms 
    • イベントログメッセージは次のように表示されます。
 Mon Aug 09 21:18:15 +0800 [node1: kernel: Nblade.cifsLockStateMismatch:debug]: params: {'pMessage': 'Leaked share lock?'} Mon Aug 09 21:19:38 +0800 [node1: kernel: Nblade_CifsOperationTimedOut_1:error]: params: {'remoteBladeID': '12345678-9012-3456-7890-123456789012 (node1)', 'cmdRestartCnt': '0', 'vserverId': '4', 'commandName': 'SMB2_COM_CREATE', 'isQosEnabled': 'QoS_disabled', 'lastSpinNpError': 'SPINNP_NO_FO_ERROR', 'localIpAddress': '10.1.2.3', 'lastCsmError': 'CSM_TIMEOUT', 'clientIpAddress': '10.2.3.4', 'suspensionCnt': '7', 'dsId': '0'} 

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