Hi team, here's a new guide.
1. Determine the error details and error time.
Log in to OperationCenter and choose Quick Links > eReplication.
On the eReplication page, click the background task list in the upper right corner, select the task for which the service instance fails to be deleted.
The error details are displayed at the bottom and the task end time is recorded.

II. Basic Check
1. If the error details are "Insufficient license permissions", apply for the corresponding DR service license (VHA, CSDR, or CSHA) by referring to HUAWEI CLOUD Stack 6.5.1 License Guide 03, and import the license to eReplication (https://support.huawei.com/enterprise/zh/doc/EDOC1100105297?idPath=22658044|7919788|9856606|23864287).
2. If the error details are "The secondary volume of the volume whose protection needs to be removed has snapshots and cannot be deleted."
Log in to the EVS page at the DR site, check the snapshot information, confirm with the customer that the snapshot is not used, and delete the instance again.
III. In-depth Check
If neither of the preceding conditions is met, locate the fault based on logs.
1. Choose Settings > Log Management > System Debug Logs and click Export.

2. Search for logs.
Decompress the exported log package DataCollect.zip to the DataCollect\BCManager8.0.1_MAIN\Logs\LegoRuntime\logs\DRM directory. You are advised to use Notepad++ to open DRM_FusionShpere_OpenStack.log.
A Search keyword "delete replica failed:replicaId="
If a statement is hit and the time is the same as the latest operation, the HyperMetro or remote replication pair fails to be deleted. Send the statement information to the drextend contact person for further processing.
B Search keyword "replicationId can not be removed from cg"
If a statement is hit and the time is the same as the latest operation, it can be determined that the pair fails to be removed from the consistency group. In this case, the statement information is sent to the drextend contact person for further processing.
C Search for the keyword "the VolumeReplicationCgInfo status error"
If a statement is hit and the time is consistent with the latest operation, the HyperMetro or remote replication consistency group fails to be deleted. Send the statement information to the drextend contact person for further processing.
D Search keyword "delete volume failed:volumeId="
If a statement is hit and the time is the same as the latest operation, the DR volume fails to be deleted. Send the statement information to the Cinder contact person for further processing.