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Flash Cacheが再ウォームアップフェーズで停止し、挿入を受け付けません

環境

ONTAP 9.3P8以前のリリース

問題

Flash Cacheが再ウォームアップフェーズで停止し、次の症状で挿入を行うことはできません。

  • ディスクレイヤからのレイテンシが高い
  • 高いディスク利用率です
  • Flash Cacheのキャッシュの挿入/ヒット率が低い

Flash Cacheのキャッシュの挿入/ヒット率が低いことを確認するには、次の手順を実行します。

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 キャッシュヒットがないことを示す0%の値を指定する必要があります
  • inserts 10秒未満にする必要があります。これは、Flash Cacheにデータが挿入されていないことを示します

 

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