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共有へのCIFSクライアント接続が、コマンド名SMB2_COM_SESSION_SETUPのNblade_CifsOperationTimedOut_1エラーでハングする

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Category:
ontap-9
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nas
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環境

  • ONTAP 9
  • CIFS

問題

  • 共有へのCIFSクライアント接続がハングする
  • EMSログに表示される情報:

[node-01: kernel: Nblade_CifsOperationTimedOut_1:error]: params: {'remoteBladeID': '00000000-0000-0000-0000-000000000000', 'cmdRestartCnt': '0', 'vserverId': '27', 'commandName': 'SMB2_COM_SESSION_SETUP', 'isQosEnabled': 'QoS_disabled', 'lastSpinNpError': 'SPINNP_NO_FO_ERROR', 'localIpAddress': '10.xx.yy.22', 'lastCsmError': 'CSM_OK', 'clientIpAddress': '10.xx.zz.88', 'suspensionCnt': '1', 'dsId': '0'}

secd: secd.rpc.server.request.dropped:debug]: The RPC secd_rpc_auth_extended sent from NBLADE_CIFS was dropped by SecD due to memory pressure. in Secd log: SecD RPC Server: Too many outstanding Generic RPC requests: sending System Error to RPC RPC TOOK TOO LONG: | RPC used 6617 seconds (max is 23)

  • secd logs show RPC requests sitting in SECD queue for long times.

[kern_secd:info:16176] | [000.000.015]  debug:  Worker Thread 34507281152 processing RPC 151:secd_rpc_auth_extended with request ID:30219 which sat in the queue for 21 seconds. { in run() at src/server/secd_rpc_server.cpp:2306 }
[kern_secd:info:16176] | [000.000.013]  debug:  Worker Thread 34507279872 processing RPC 151:secd_rpc_auth_extended with request ID:30184 which sat in the queue for 19 seconds. { in run() at src/server/secd_rpc_server.cpp:2306 }

  • 影響を受ける LIFと同じノードにあるSVM(EMSメッセージのlocalIpAddress) も影響を受ける可能性があります。
  • パケットトレースでは、 短時間に膨大な数の認証CIFS Session Setup 要求が表示され、一部の 要求が受信されます。 Error: STATUS_INTERNAL_ERROR

347672   2021-08-12 08:01:55.550 10.xx.yy.224 10.xx.zz.22  SMB2 Session Setup Request

352783   2021-08-12 08:02:36.293 10.xx.zz.22  10.xx.yy.224 SMB2 Session Setup Response, Error: STATUS_INTERNAL_ERROR

  • 複数セッションの数が多いクライアントは、パケットトレース分析に従って多数の認証要求を送信します。

::> cifs session show  -vserver <svm>

::> cifs session file show  -vserver <svm> -connection-id <integer>

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