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由于Flash Cache发生故障、ONTAP重新启动后延迟较长

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适用场景

  • 修复了错误1164008的ONTAP版本
    • ONTAP 9.3P9+
    • ONTAP 9.4P4+
    • ONTAP 9.5及更高版本
  • Flash Cache

问题描述

在ONTAP重新启动后立即观察到高延迟、并出现以下症状:

  • 增加磁盘使用量
  • 磁盘IO延迟较长
  • Flash Cache无命中(ext_cache)。示例

::> system node run -node node_name stats show -p flexscale-access
Cache                         Reads     Writes      Disk Reads
Usage Hit   Meta  Miss   Hit  Evict  Inval  Insert Chain  Blocks Chain  Blocks  Replaced
%    /s   /s   /s    %   /s   /s    /s   /s    /s   /s    /s    /s
45   703   11   39171   1    0    0    0    0    0    0    0     109
45   320   26   37607   0    0    0    0    0    0    0    0     98
45   903   51   38018   2    0    0    0    0    0    0    0     114
...

  • Flash Cache卡的状态为 ok  In sysconfig -a 
slot 1: Flash Cache NVMe Serial Number: ZEP00GPR Part Number: 119-00329 Hardware Revision: A0 Firmware Version: NA03 Model Name: X3311A Capacity: 1024 GB State: ok

注:

  • 此现象非常接近 错误1164008中所述的内容,尽管它已经在一个固定版本上。 

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