Flash Cache 停留在重新恢复阶段，但不会接受插入

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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>

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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