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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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适用于

  • 集群模式 Data ONTAP 8
  • ONTAP 9
  • SnapMirror

解答

这不是一个受支持的进程。

DP 镜像使用 BRE (块复制引擎)、它跟踪每个块、不知道文件系统结构。采用 XDP 镜像、 SnapVault 和版本独立 SnapMirror 的引擎是 LRE/LRSE (逻辑复制引擎 / 逻辑复制引擎、具有存储效率)。LRSE 根据文件系统结构在逻辑上跟踪数据。因此,在尝试重新同步时、 BRE 无法找到任何包含数据基于块的引用的快照、因此它会报告没有通用快照、因为基于块的引擎无法理解逻辑跟踪。

如果尝试将最初是 XDP 关系的关系转换为 DP 关系、然后尝试重新同步到源关系、则会失败并显示以下错误消息:

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

如果尝试将最初是 XDP 关系的关系转换为 DP 关系、然后尝试更新该关系、 SnapMirror show 命令会显示以下错误消息:

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

根据工程设计,如果源卷和目标卷仍具有相同实例和版本 UUID 的快照、则转换为 XDP 关系的 DP 关系可以转换回 DP 关系。

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