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SnapMirror策略类型是什么?它们的含义是什么?

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适用场景

  • 集群模式 Data ONTAP 8.3 
  • ONTAP 9 

问题解答

从集群模式Data ONTAP 8.3开始、为版本灵活(在ONTAP 9及更高版本中也称为统一复制)的SnapMirror关系引入了SnapMirror策略类型。这些策略类型会对SnapMirror关系的行为产生显著影响、并可在选择要复制和保留的数据时提供更大的灵活性。此外、还创建了其他默认策略来使用新策略类型。

策略类型 定义
async-mirror 其行为与DP镜像类似。此策略类型不支持包含用户定义的Snapshot标签的规则。它仅允许使用两个预定义标签
sm_created和all_source_snapshots 对于这两个标签,此策略规则仅支持两种组合形式,即sm_created或者sm_created和all_source_snapshots。 

mirror-vault

允许灾难恢复和存储到同一个卷。将源的活动文件系统复制到目标、并允许目标将数据保留较长的保留期限。数据会使用 sm_created 或系统定义/自定义规则进行复制、并使用基于用户定义的Snapshot标签的用户定义规则保留较长时间。 
vault 仅存储和备份。此策略类型将关系定义为SnapVault 、而不是版本灵活的SnapMirror。

默认策略:

clusterA::> snapmirror policy show
Vserver Policy             Policy Number         Transfer
Name    Name               Type   Of Rules Tries Priority Comment
------- ------------------ ------ -------- ----- -------- ----------
clusterA
        DPDefault         async-mirror  1     8  normal  Default policy for DP relationship.
  SnapMirror Label: sm_created                         Keep:       1
                                                Total Keep:       1
 
clusterA
        MirrorAllSnapshots async-mirror  2     8  normal  Asynchronous SnapMirror policy for mirroring all snapshots and the latest active file system.
  SnapMirror Label: sm_created                        Keep:       1
                    all_source_snapshots                           1
                                                 Total Keep:       2
 
clusterA
        MirrorAndVault    mirror-vault  3     8  normal  A unified Asynchronous SnapMirror and SnapVault policy for mirroring the latest active file system and daily and weekly snapshots.
  SnapMirror Label: sm_created                         Keep:       1
                    daily                                          7
                   weekly                                        52
                                                 Total Keep:      60
 
clusterA
        MirrorLatest      async-mirror  1     8  normal  Asynchronous SnapMirror policy for mirroring the latest active file system.
  SnapMirror Label: sm_created                         Keep:       1
                                                 Total Keep:       1
 
clusterA
        XDPDefault        vault         2     8  normal  Default policy for XDP relationship with daily and weekly rules.
  SnapMirror Label: daily                              Keep:       7
                    weekly                                       52
                                                 Total Keep:      59

 

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