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If the upgrade process of an element fails:
If the admin does not specify rollback all, when the element upgrade fails, the system stops the entire upgrade process and display the failure status on the Upgrade Management page. The entire upgrade process does not roll back. Only the failed element upgrade rolls back.
If the admin specifies rollback all, when the element upgrade fails, the system stops the upgrade and rolls back the overall upgrade process. The system rolls back only the successfully upgraded elements.