Constraints

During the OS migration, RPM packages need to be uninstalled, installed, and updated. As a result, the OS may restart unexpectedly. Before the migration, the system disk is automatically backed up. You can also create a server backup to manually back up the system disk.
The available OS memory should be larger than 128 MB, the available system disk space (required for running the migration tool) be larger than 5 GB, and the available space of the boot partition be larger than 200 MB.
The name of a custom RPM package must be different from that of an OS RPM package. Otherwise, the custom RPM package will be deleted by the migration tool during the migration.
After the OS migration, the system disk type cannot be changed.
Packages in the source OS may conflict with the target OS. These packages will be automatically deleted by the migration tool. For the list of conflicting packages, see Conflicting Packages.
DNF is used during OS migration. If the DNF version in the source OS is too early, the migration will be affected. Upgrade it in the source OS before the migration.