SVM DR 関係を更新または再同期できません。ボリュームに共通の Snapshot コピーが見つかりません

環境

• ONTAP 9.x
• SnapMirror
• SVM DR

問題

• update または resync SVM DR関係の作成が失敗します
• SnapMirrorで共通のSnapshotコピーが見つからないことが報告される： 

Transfer for volume "<volume>" failed. Reason: No common Snapshot copy found between <SVM>:<volume> and <SVM-DR>:<volume>. Delete the volume using the (privilege: advanced) "volume delete -force" command. Then, perform a SnapMirror resync using the "snapmirror resync" command. Execute "snapmirror show -destination-vserver <SVM-DR> -fields last-transfer-error,unhealthy-reason -expand" to check if the constituent volumes have encountered errors.

• デスティネーションボリュームを削除できない場合があります。
  例：

cluster_dst::*>set advanced
cluster_dst::*> volume delete -vserver SVM1 -volume volume1 -force true 
Error: command failed: Volume volume1 in Vserver SVM1 must be offline to be deleted. 
cluster_dst::*> volume offline -vserver SVM1 -volume volume1 -force true 
Warning: Forcing offline volume volume1 in Vserver SVM1 can potentially disrupt access to files in other volumes. 
Do you want to continue? {y|n}: y
vol offline: Error off lining volume "SVM1:volume1". Error while deleting junction.