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Flash Cache 停留在重新恢复阶段,但不会 接受插入

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21
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Votes:
0
Category:
ontap-9
Specialty:
perf<a>性能</a><a>闪存缓存</a><a /><a>1164008</a><a>闪存</a><a>重新恢复</a>
Last Updated:

适用场景

ONTAP 9.3P8 及更早版本

问题描述

Flash Cache 停留在重新恢复阶段,不接受插入,并出现以下症状:

  • 磁盘层延迟较高
  • 磁盘利用率高
  • Flash Cache 中的缓存插入 / 命中率较低

要确认 Flash Cache 中的缓存插入 / 命中率较低,请执行以下操作:

示例:

cluster::> set advanced

Warning: These advanced commands are potentially dangerous; use them only when directed to do so by NetApp personnel.
Do you want to continue? {y|n}: y

cluster::*> statistics start -sample-id <test1> -object ext_cache_obj -counter inserts|hit_percent|rewarm_aggrs_failed
Statistics collection is being started for sample-id: test1

fas8200-2n-dal-1::*> statistics stop -sample-id <test1>
Statistics collection is being stopped for sample-id: test1

fas8200-2n-dal-1::*> statistics show -sample-id <test1>

Object: ext_cache_obj
Instance: ec0
Start-time: 5/18/2021 10:43:17
End-time: 5/18/2021 10:43:25
Elapsed-time: 8s
Scope: cluster-1a

   Counter                            Value
   -------------------------------- --------------------------------
  hit_percent                           0%
  inserts                              0

Object: ext_cache_obj
Instance: ec0
Start-time: 5/18/2021 10:43:17
End-time: 5/18/2021 10:43:25
Elapsed-time: 8s
Scope: cluster-1b

   Counter                            Value
   -------------------------------- --------------------------------
  hit_percent                           0%
  inserts                              0
4 entries were displayed.

注: 

  • hit_percent 应为 0% ,表示无缓存命中
  • inserts 应低于 10/s ,表示 Flash Cache 中未插入任何数据

 

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