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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
  • Cloud Volume ONTAP

问题解答

  • 活动文件系统更改越多、Snapshot副本保留时间越长、副本占用的空间就越多。
  • 这是因为WAFL从不覆盖数据块。
  • 如果修改了文件、更新的块将写入新位置。
  • 如果从活动文件系统中删除数据、则包含这些数据的旧Snapshot副本仍会指向这些块、因此不会释放空间。
  • 因此、快照可能会变得更大、并超出快照预留、从而溢出到AFS (活动文件系统)。
  • 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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