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当 SMB 关闭请求运行时间较长时、删除大目录所需的时间较长

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状态信息

适用于

ONTAP 9

SMB

问题

  • 删除一个长目录需要很长时间,长时间运行的 SMB 关闭请求( WAFL_SPINNP_CLOSE )是导致性能下降的主要原因,这是由于 WAFL CPU 计划中的 CPU 运行时间极长所致。
  • 这可以在许多不同的地方得到确认。 
    • 数据包跟踪中 SMB 关闭请求的高服务响应时间
    • 对象中关闭操作的高延迟 spinhi
      • spinhi:<volume_name>:spinhi_fileop_latency.Close:41740.05u
    • 对象smb或中的关闭操作延迟较高 smb2
      • smb2:<svm_name>:close_latency:39380.24us
    • Per-Msg Wait Avgwaffinity_stats 中的高 CPU 等待时间 () 以及极高的 CPU 运行时间 () Per_msg Wait Avg)

Class Queue   Msg Type                            #Msgs (new+restarts)    Per-Msg CPU Avg             Per-Msg Wait Avg

SERIAL hipri   WAFL_SPINNP_CLOSE          62419          1343                        44103

注:平均 CPU 运行时间为 1343us 、而本示例中的平均 CPU 等待时间为 44103us

  • 目录块占 ReadAhead 读取的所有块的大多数

ra.requested                           =  230178001

 ra.dir_blocks = 223951083

 

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