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LUN 的快照如何工作?

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适用于

Data ONTAP

解答

  • Snapshot 是本地保留的数据只读时间点映像
  • 执行 LUN 快照时、 Snapshot 会将指针复制到磁盘上相应的 LUN 块。没有复制或移动数据。
  • 当 LUN 数据发生更改时、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。 

3014144__en_US__3014144 snapshot.jpg

  • 用于 snap delta 显示 Snapshot 副本之间的数据更改率。如果使用时没有任何参数、则会显示系统中所有卷的快照之间数据的更改速率、或系统中所有聚合snap delta -A的更改速率。

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

  • 如果指定了卷,则会显示该特定卷的数据更改率

snap reclaimable <volname snapshot-name>  显示在以下情况下要回收的空间量 此时将从卷中删除上述快照列表
 3014144__en_US__3014144Image_4.jpg

其他信息

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