(Original Figure) Primary/Secondary DR Workflow[1]

Backup Workflow

1. The DR management plane of SCP initiates a backup request to the management service of HCI.
2. The management service of HCI prepares for backup. It checks the image link and the storage space, generates a temporary image file, and passes the backup request to the data plane service of HCI.
3. After receiving the backup request, the data plane service writes the new production data to the original image file and writes the original production data to the temporary image file.
4. The data plane service reads data from the original image file, writes the data to the backup image file through the backup proxy, and then replicates the content of the temporary image file to the backup image file.
5. After the backup is complete, the result is sent to the data plane service of HCI and then passed to the DR management plane of SCP. This way, the entire backup task is complete.

Backup Transmission Workflow

1. The DR management plane of SCP initiates a backup transmission preparation request to the management service of the primary site, and checks the integrity and size of the image file to be transmitted and the breakpoint information.
2. The DR management plane of SCP initiates a backup transmission preparation request to the management service of the secondary site, checks the storage space, and prepares the image file.
3. The DR management plane of SCP initiates a backup transmission request to the backup management service of the primary site.
4. The backup management service of the primary site reads data from the backup image file in the backup repository on the primary site and transmits the data to the backup management service on the secondary site through the backup proxy. Then, the backup management service writes the data to the backup image file in the backup repository on the secondary site. After the backup image file is imported, it can be used as a valid backup on the secondary site.
5. After backup transmission is complete, the result is sent to the backup management service of HCI and then passed to the DR management plane of SCP. This way, the entire backup transmission task is complete.