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增量副本的级别1到9之间有何区别

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适用场景

  • ONTAP 9
  • NDMP

问题解答

备份级别说明:
  • 级别0备份: 这是完整备份、表示指定源路径中的所有数据都会复制到目标路径。这将作为后续增量备份的基础
  • 级别1到9: 这些级别用于执行增量备份、这种备份只会复制自上次备份以来更改过的数据、而备份级别较低或相等
注: 
  • 级别编号越高、增量备份就越具体、这意味着它将仅包含自上次备份级别越低以来发生的更改
  • 例如、级别3备份将包括自上次级别2、级别1或级别0备份(以最近一次为准)以来的更改
NDMP备份级别的功能:
  • 级别0:完整备份。源中的所有文件和目录都会复制到目标、而不管是否进行了更改
  • 级别1:相对于上次完整备份的增量备份(级别0)。仅复制自上次完整备份以来修改的文件和目录
  • 级别2到9:相对于上一个较低级别备份的增量备份。例如、级别2备份会复制自上次级别1备份以来修改的文件、级别3备份会复制自上次级别2备份以来修改的文件、依此类推
图示例:
  • 在几天内完成一系列备份的情形:

案例2010210444_ NDMP backup_Diagram.png

结束语:
  • NDMP备份级别仅复制自上次较低级别的备份以来修改过的文件、有助于减少备份的数据量
  • 这样可以优化存储空间使用、并减少执行备份所需的时间
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