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Inode 缓存 - 文件操作严重暂停,造成大量延迟

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Category:
ontap-9
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perf
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适用于

  • ONTAP 9
  • NFS
  • SMB

问题描述

基于文件/目录的操作总体性能非常差,可能出现以下症状:

  • 许多长时间运行的 READDIR/READDIR+ 请求可以从数据包跟踪中识别出来,在最坏的情况下可能需要数十秒甚至数百秒 
    • 注:  这同样适用于 SMB2 QUERY_DIRECTORY 请求或其他 SMB 版本中的等效内容
  • 其他文件操作类型的高延迟,如 GETATTR、LOOKUP、ACCESS 等。
  • NFS/SMB 客户端上的超时
  • 各种性能监控工具报告的极高延迟
  • EMS 的以下 wafl.readdir.expired 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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