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SMB 3暗号化を有効にすると、CIFSのパフォーマンスが低下します

環境

  • ONTAP 9
  • SMB 3
  • SMB署名とSMB暗号化の両方、またはいずれか一方
  • FAS 2500シリーズ

問題

  • SMB 3暗号化を有効にすると、CIFSセッションのスループットが低下したり、レイテンシが増大したりすることが確認されます
  • SMB署名が有効になっており、次のメッセージが表示されます。
Node: FAS2554-01 Time: Tue, May 03 20:44:54 2022 -0400 Severity: ALERT Message: Nblade.cifsNonAesNiBytesProc: Excessive SMB3 cryptographic processing load (AES-NI instruction set is not supported). Description: This message occurs when a system with CPUs that do not support the AES-NI instruction set is performing SMB3 encryption or signing of a large amount of data. These cryptographic operations can degrade performance severely for both SMB and other system operations. Corrective Action: Avoid encrypted or signed SMB3 traffic on systems that do not support the AES-NI instruction set. Source: SMBOffloadPool_00 Sequence#: 1065458

 

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