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extCache.io.writeErrorを使用したボリュームのレイテンシとディスク利用率の高さ

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環境

  • ONTAP 9
  • NVMeベースのFlash Cacheを搭載したAll FAS システム

問題

  • 最大350msのその他のボリュームレイテンシが高くなります
  • ディスク利用率が最大90%に達しています
  • 複数Nblade.CifsOperationTimedOutのイベント

Nblade.CifsOperationTimedOut: Detected a timed out CIFS operation. SMB command for this operation: SMB2_COM_QUERY_DIRECTORY, Number of times this command was suspended: 6, Number of times this command was restarted: 0, Last CSM error during this operation: CSM_OK, Remote blade UUID: 00000000-0000-0000-0000-000000000000 (cluster01), Is QoS enabled: QoS_disabled, Last nBlade error during this operation: 410, Client IP address: 10.1.2.3, Local IP address: 10.1.3.4, Target Vserver ID: 99, Target disk's DSID: 12345, Target Vserver Name: vserver01

[cluster01: wafl_exempt10: wafl.memory.statusLowMemory:notice]: WAFL is running low on memory, with 914MB remaining.

  • 複数 WAFL external cache I/O write error のイベント

[cluster01: wafl_exempt03: extCache.io.writeError:notice]: WAFL external cache I/O write error: Insertq_save: unable to set up context chain, code 0

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