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LUN 的快照如何工作?

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适用场景

Data ONTAP

问题解答

  • Snapshot是 数据在本地保留的只读时间点映像
  • 为LUN创建快照时、Snapshot会将指针复制到  磁盘上相应的LUN块。未复制或移动任何数据。
  • 如果LUN数据发生更改、则会将其写入磁盘上的新块。Snapshot将继续指向包含旧数据的块。
  • Snapshot技术是Data ONTAP的一项功能。 

LUN的快照如何工作?

  • snap delta 用于显示两个Snapshot副本之间的数据更改率。如果不使用任何参数,则显示系统中所有卷的快照之间的数据更改率,如果使用,则显示所有聚合的数据更改率 snap delta -A

snap delta [ vol_name] [ snapshot-name ] [ snapshot-name ]

  • 如果指定了volume、则会显示该特定卷的数据更改率

snap reclaimable <volname snapshot-name>  显示在从卷中删除上述快照列表后可回收的空间量
 LUN的快照如何工作?

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