This article provides information about the order/hierarchy that users should follow when upgrading Lithium nodes, including important considerations that users should take into account during the upgrade process.
The servers must be upgraded in the following order:
Since all the servers will be upgraded one by one, it is expected that the network will be in a mixed release mode until all upgrades are complete. If the upgrade is a supported path (e.g., from 16.8 to 17.7), the traffic servers should be able to process traffic without any known issues during the upgrade. The following statuses should not present any problems when upgrading:
Considerations When Upgrading