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索引节点高速缓存 - 文件操作在 load_inode_no_wips 上大量挂起

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ontap-9
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状态信息

适用场景

  • ONTAP 9
  • NFS
  • SMB

问题描述

基于文件 / 目录的操作的总体性能非常差、可能出现以下症状:

  • 许多运行的远程 READR/ READDIR + 请求都可以通过数据包跟踪来识别、在最坏的情况下可能需要数十秒甚至数百秒的时间 
    • 注意: SMB 2 查询目录请求或其他 SMB 版本中的等效项也是如此
  • 其他文件操作类型(如 GetAttr 、查找、访问等)的延迟较高 
  • NFS/SMB 客户端超时
  • 各种性能监控工具报告的极高延迟
  • wafl.readdir.expired EMS 发出的以下错误消息可能表明存在类似问题

[<node_name>: wafl_exemptxx: wafl.readdir.expired:error]: A READDIR file operation has expired for the directory associated with volume <volume_name>/@vserver:<vserver_uuid> Snapshot copy ID xx and inode <inode_number>.


 

 

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