Tech Tip: DDLDCLOG area must be FORMATted when upgrading to r18.5.
The documentation is a little less specific than it should be in this area.
Despite what you can find in the Installation and Maintenance Guide and in RI58914, you must FORMAT the DDLDCLOG area when upgarding to r18.5.
It's good practice to do it on any upgrade regardless of whether it's mentioned in the documentation or not.
See TEC1420497 for more details.