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什么会影响 snapshot 大小并导致 snapshot 溢出

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ontap-9
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core
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适用于

  • 7-模式 Data ONTAP
  • 集群模式 Data ONTAP 8
  • ONTAP 9
  • Snapshot
  • Cloud Volume Ontap

回答

  • 活动文件系统更改越多,Snapshot 副本保留时间越长,副本消耗的空间就越多。
  • 这是因为 WAFL 从不覆盖数据块。
  • 如果文件被修改,更新的块将被写入新位置。
  • 如果从活动文件系统中删除数据,则包含该数据的旧 Snapshot 副本仍将指向这些块,因此不会释放空间。
  • 因此,Snapshot 可能会变大并超出其 Snapshot 预留范围,从而溢出到 AFS(活动文件系统)中。
  • 如果发生这种情况,用户可以使用以下选项之一(或组合):
  1. 增加快照保留(增加卷的大小或启用卷的自动大小模式)
  2. 更改快照保留率
  3. 配置快照自动删除
  4. 将快照备份到灾难恢复
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