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FlexGroup でのNFSのその他の処理では、散発的に発生する遅延が発生する

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Category:
ontap-9
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perf<a>2009213683</a>
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環境

  • ONTAP 9
  • FlexGroup
  • NFSv3
  • RAL(リモートアクセスレイヤ)

問題

  • 大規模なディレクトリのトラバースでの長い遅延–NFSv3ルックアップ要求とREADDIR / READDIRPLUS要求のレイテンシが高くなります。 
  • 高レイテンシは、監視ツールによっては数秒程度で、レイテンシが報告される頻度にも影響します。
  • wafl.readdir.expired EMSログで確認:

Tue Jun 21 05:02:10 CST [<node_name>: wafl_exempt00: wafl.readdir.expired:error]: A READDIR file operation has expired for the directory associated with volume fg1__0084/@vserver:5edc27ba-4d55-11ea-b14d-d039ea425425 Snapshot copy ID 0 and inode 4348458.

  • Nblade.nfsLongRunningOp EMSログで確認:

Tue Jun 21 03:39:50 CST [<node_name: kernel: Nblade.nfsLongRunningOp:debug]: Detected a long running network process operation. The client IP address:port is 10.239.42.xx:912. The local IP address:port is 10.239.0.x:2049. The protocol requesting the operation is NFS3. The RPC Program Number for the operation is 100003. The RPC Procedure Number for the operation is 8. The disk process UUID is 127db8734c7211eaadfbd039ea4251d9. The Vserver identifier is 9.

 

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