You can run the e2e-migrate CLI within the maintenance window, which takes backup and migrates data from old appliances to new appliances.

Note:

By default, the migration tool does not delete any old backups attempted to preserve data. If backup exists, it is reused in retry attempts. You can provide -c option to cleanup up the existing backups before taking fresh backup.

Important:

Do not specify <-i option> here because the appliances are already deployed.

e2e-migrate CLI Help

$ python3 vm_cn_migration.py e2e-migrate -h
usage: vm_cn_migration.py e2e-migrate [-h] [-i INCLUDE_DEPLOY] [-c CLEANUP] input_file

Deploys and migrates entire topology with one command

positional arguments:  
   input_file          input file containing TCA manager and TCA-CP details.

options:  
  -h, --help            show this help message and exit  
  -i INCLUDE_DEPLOY, --include-deploy INCLUDE_DEPLOY                        
                        if specified, runs deploy as part of this command. Default: false  
  -c CLEANUP, --cleanup CLEANUP                        
                        if specified, cleans up the directory of old backups. Default: false

Input is same as specified above.

e2e-migrate CLI

python3 vm_cn_migration.py e2e-migrate input.json