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是否可以在 ONTAP 中将 XDP 关系转换为 DP 关系?

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snapmirror
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适用场景

  • ONTAP 9
  • SnapMirror

问题解答

不支持、不支持将XDP关系转换为DP关系

追加信息

为什么我不能转换它?
  • 类型DP使用BRE (Block Replication Engine、块复制引擎)跟踪每个块、并且不知道文件系统结构
    • BRE从源聚合读取数据块。
    • 然后、它会通过网络将数据发送到目标聚合。
    • 最后,它会将写入目标聚合。
  • XDP使用的类型为LRE/LRSE (具有存储效率的逻辑复制引擎/逻辑复制引擎)。 
    • LRSE会根据文件系统结构从逻辑上跟踪数据。
    • XDP传输会执行FlexVol 内的逻辑写入。
  • 键入XDP镜像、SnapVault 和不依赖于版本的SnapMirror的引擎为LRE/LRSE (具有存储效率的逻辑复制引擎/逻辑复制引擎)。 
    • LRSE会根据文件系统结构从逻辑上跟踪数据。
    • XDP传输会执行FlexVol 内的逻辑写入。
  • 因此、在尝试重新同步时、BRE找不到任何包含基于块的数据引用的快照、因此它会报告没有通用快照、因为基于块的引擎无法识别逻辑跟踪。
尝试转换后的常见问题
  • 重新同步回源(从XDP转换为DP后)将失败、并显示以下错误消息

No common Snapshot copy found between <source><destination>

  • 运行snapmirror show命令(从XDP转换为DP后)将失败、并显示以下错误消息

cluster_82b::> snapmirror update -destination-path vs2:vs2_sv_dest Operation is queued: snapmirror update of destination vs2:vs2_sv_dest
cluster_82b::> snapmirror show -destination-path vs2:vs2_sv_dest

Source Path: vs1_test:compress_test
Destination Path: vs2:vs2_sv_dest
Relationship Type: DP
SnapMirror Schedule: -
Tries Limit: -
Throttle (KB/sec): unlimited
Mirror State: Snapmirrored
Relationship Status: Idle
Transfer Snapshot: -
Snapshot Progress: -
Total Progress: -
Snapshot Checkpoint: -
Newest Snapshot: 5min.2015-05-04_0830
Newest Snapshot Timestamp: 05/04 08:32:57
Exported Snapshot: 5min.2015-05-04_0830 Exported Snapshot Timestamp: 05/04 08:32:57
Healthy: false
Unhealthy Reason: Transfer failed.
Constituent Relationship: false
Destination Volume Node: cluster-01
Relationship ID: 003d8e96-f25a-11e4-bbdf-123478563412
Transfer Type: -
Transfer Error: -
Current Throttle: -
Current Transfer Priority: -
Last Transfer Type: update
Last Transfer Error: Destination was previously used as the destination of an XDP relationship. Using an XDP destination volume as the destination volume for a DP relationship is not supported.
Last Transfer Size: -
Last Transfer Duration: -
Last Transfer From: vs1_test:compress_test Last Transfer End Timestamp: 05/04 08:41:14
Progress Last Updated: -
Relationship Capability: 8.2 and above
Lag Time: 0:8:20
SnapMirror Policy: DPDefault

  • 如果源卷和目标卷的Snapshot仍具有具有相同的实例和版本UUID、则转换为XDP关系的DP关系可以转换回DP关系。
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