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如果 SMB 签名压力较高,则会导致网络 CPU 域的 SMB3 延迟较高

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Votes:
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Category:
ontap-9
Specialty:
perf<a>1084228</a><a>SMB 签名</a><a>SMB 加密</a><a>CPU_network</a><a>CPU N 刀片</a>
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状态信息

适用场景

  • 9.7之前的ONTAP 版本
  • SMB 3.
  • SMB2

问题描述

  • Unified Manager Grafana 的 SMB 延迟较长。
    • 在延迟细分部分中,大部分延迟来自 NetworkCPU N-blade,具体取决于用于监控性能的工具
  • 受影响的 SVM 具有大量 SMB3 或 SMB3.1 连接
cluster1::> set -c off advanced cluster1::*> statistics start -node node1 -object cifs -counter total_smb3_1_connections_count|total_smb3_connections_count cluster1::*> statistics show -sample-id sample_1 Object: cifs Instance: testsvm Start-time: 11/22/2021 15:39:20 End-time: 11/22/2021 15:42:00 Elapsed-time: 160s Scope: testsvm Counter Value -------------------------------- -------------------------------- total_smb3_1_connections_count 1031 total_smb3_connections_count 1254
  • 受影响的 SVM 已签署会话,并且每秒要签名的数据量也很多
 cluster1::*> statistics start -node node1 -object smb2 -counter bytes_signed_rate|signed_sessions cluster1::*> statistics show -sample-id sample_2 Object: smb2 Instance: testsvm Start-time: 11/22/2021 15:48:17 End-time: 11/22/2021 15:49:05 Elapsed-time: 48s Scope: testsvm Counter Value -------------------------------- -------------------------------- bytes_signed_rate 10240000B signed_sessions 128 
  • 网络 CPU 不一定饱和
    • 平均 CPU 可能不高
    • Nwk_Exmpt sysstat -M中的CPU域
  • 其他协议也可能会受到影响,例如 NFS 或 iSCSI 。因为它们必须为具有 SMB 签名工作负载的相同网络线程完成

 

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