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外部キャッシュでは、-is-rewarm-enabledがtrueに設定されていても、ノードのリブート後に使用率とhit_percentの両方が0になる

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Category:
ontap-9
Specialty:
core
Last Updated:

環境

  • FAS
  • AFF
  • ONTAP 9
  • Flash Cache

問題

  1. ノードがリブートする前に、  Flash Cacheにデータブロックヒットと使用状況があることが統計によって示されます 。

     ::*> statistics show -sample-id test

     Object: ext_cache_obj
     Instance: instance_name
     Start-time: 3/11/2025 23:49:43
     End-time: 3/12/2025 00:05:54
     Elapsed-time: 971s
     Scope: Node-01

      Counter                            Value
      -------------------------------- --------------------------------
      hit_percent                           31%
      size                              880
      usage                              86

  2. is-rewarm-enabledをtrueに設定して1時間前にノードがリブートされました。
    Wed Mar 12 01:52:02 +0900 [Node-01: ec_warming_control_thread: extCache.rw.start:debug]:
    Wed Mar 12 01:52:27 +0900 [Node-01: ec_warming_control_thread: extCache.rw.complete:debug]:
    Wed Mar 12 01:52:27 +0900 [Node-01: ec_warming_control_thread: extCache.rw.replay.start:info]: WAFL external cache warming replay has begun for aggregate aggr01_0.
    Wed Mar 12 01:52:27 +0900 [Node-01: ec_warming_control_thread: extCache.rw.replay.complete:info]: WAFL external cache warming replay complete for aggregate aggr01_0 with invalidation log 0%% full.
    Wed Mar 12 01:52:37 +0900 [Node-01: svc_queue_thread: extCache.QoS:info]: External Cache QoS is: Enabled.
    Wed Mar 12 01:53:21 +0900 [Node-01: ec_exempt_worker_thread: extCache.aggregate.invalidate:info]: WAFL external cache: Starting invalidation for aggregate in map slot 2.
    Wed Mar 12 01:53:56 +0900 [Node-01: ec_exempt_worker_thread: extCache.aggregate.invalidate:info]: WAFL external cache: Completed invalidation for aggregate in map slot 2 in 35 seconds.
  3. statistics show  その後の5分間は、usagehit_percent両方が0になります。

::*> statistics show -sample-id test

Object: ext_cache_obj
Instance: instance_name
Start-time: 3/12/2025 02:42:44
End-time: 3/12/2025 02:46:10
Elapsed-time: 206s
Scope: Node-01

  Counter                            Value
  -------------------------------- --------------------------------
 hit_percent                          0%
  size                              880
 usage                             0

 

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