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什么是 Snapshot 自动删除?如何在 7- 模式下使用它?

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适用场景

  • Data ONTAP 8 7-模式
  • Data ONTAP 7 及更早版本

问题解答

注意:在 SnapVault 更新在目标上运行并锁定快照之前、源上的 SnapVault 快照不会自动删除 

为什么在 Data ONTAP 7.1 中实施 Snapshot 自动删除?

  • Snapshot 自动删除是一项基于策略的空间管理功能,它在 Data ONTAP 7.1 (以及后续的 Data ONTAP 7G 版本)中实施、以便在卷中为用户数据恢复空间。
  • 它允许用户定义策略、以便在卷接近满时自动删除快照。它可以将存储器中的未使用空间量保持在最低水平。
  • Snapshot 自动删除仅适用于灵活卷。

Snapshot 自动删除命令语法如下所示:

filer> snap autodelete
snap autodelete [on | off | show | reset | help] |
snap autodelete ...

* 支持的选项和相应的值定义如下:

commitment          try, disrupt
trigger             volume, snap_reserve, space_reserve
target_free_space     1-100
delete_order         oldest_first, newest_first
defer_delete         scheduled, user_created, prefix, none
prefix

Snapshot 自动删除何时发生?

  • 当“触发”标准接近满时。

  volume: The volume is near full.
   snap_reserve: The reserve is near full.
   space_reserve: The space reserved is near full. (useful for volumes with
fractional_reserve < 100)

  • 什么定义 " 接近满 " ?

默认情况下,近似完全定义为 98% 。

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