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什么会影响快照大小并导致快照溢出

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适用场景

  • 7-模式 Data ONTAP
  • 集群模式 Data ONTAP 8
  • ONTAP 9
  • Snapshot

问题解答

  • 活动文件系统更改越多, Snapshot 副本保留的时间越长,副本占用的空间就越多。
  • 这是因为 WAFL 不会覆盖数据块。
  • 如果修改了某个文件,更新的块将写入新位置。
  • 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,空间不会释放。
  • 因此,快照可能会变得更大,并且会超出其快照预留空间,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. 增加快照预留(增加卷大小或启用卷的自动调整模式)
  2. 更改 Snapshot 保留率
  3. 配置 Snapshot 自动删除
  4. 将 Snapshot 备份到灾难恢复
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