跳转到主内容

Flash Cache 停留在重新恢复阶段,但不会 接受插入

Views:
5
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
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

 

CUSTOMER EXCLUSIVE CONTENT

Registered NetApp customers get unlimited access to our dynamic Knowledge Base.

New authoritative content is published and updated each day by our team of experts.

Current Customer or Partner?

Sign In for unlimited access

New to NetApp?

Learn more about our award-winning Support