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トリガーがスナップリザーブに設定されている場合、Snapshotの自動削除はすべてトリガーされるわけではありません

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環境

ONTAP 9

問題

  • Snapshotの自動削除では、triggerがsnap_reserveに設定されています。

Volume name: vol1
      State: online

      Snapshot autodelete settings: state=on, commitment=try,
          trigger=snap_reserve,
          target_free_space=20%,
          delete_order=oldest_first, defer_delete=none,
          prefix=(not specified),
          destroy_list=none
      Volume autosize settings: mode=off

  • snap_reserveの使用率が100%を超えていますが、増加しています。

::> df -h 
Filesystem         total     used    avail capacity  Mounted on       Vserver
/vol/vol1/ 
              52TB     30TB     21TB    59%  /vol1            vs0
/vol/vol1/.snapshot 
             5939GB     10TB      0B   186% /vol1/.snapshot  

::> df -h 
Filesystem         total     used    avail capacity  Mounted on       Vserver
/vol/vol1/ 
              52TB     30TB     21TB    59%  /vol1            vs0
/vol/vol1/.snapshot 
             5939GB     11TB      0B   191% /vol1/.snapshot  

  • Snapshotの自動削除では、Snapshotの削除が1つずつ開始されます。 現在のスナップショット削除スキャナが完全に完了するまで、新しい削除はトリガーされません。
Tue Jan 31 18:57:01 [node01: snap_helper: wafl.volume.snap.autoDelete:info]: Deleting Snapshot copy 'v1.2023-01-25_0300' in volume 'vol1@vserver:a1921cd8-da2f-11eb-9ccc-d039ea319cac' to recover storage.
Tue Jan 31 19:45:49 [node01: snap_helper: wafl.volume.snap.autoDelete:info]: Deleting Snapshot copy 'v1.2023-01-26_0300' in volume 'vol1@vserver:a1921cd8-da2f-11eb-9ccc-d039ea319cac' to recover storage.
Tue Jan 31 20:34:53 [node01: snap_helper: wafl.volume.snap.autoDelete:info]: Deleting Snapshot copy 'v1.2023-01-27_0300' in volume 'vol1@vserver:a1921cd8-da2f-11eb-9ccc-d039ea319cac' to recover storage.

 

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